Sounds like bootstrap isn’t loading.
I would reinstall bootstrap and/or check your package references.

I’m having an issue with one of my webpages in my ASP.NET MVC Application. I have the HTML in Webstorm, and when I open it from there, it looks as intended. When I then copy over to the View in Visual Studio all of the Form controls are a mess.
Even if I directly copy everything from Webstorm into the _layout.cshtml, leaving only the script and style links (and RenderBody();) it’s still completely off.

The Form itself is just copied from getbootstrap.com so it should be just fine. I have no clue what the issue could be, I hope someone has an idea.

Link so you can see the issue: https://imgur.com/a/bxFrr3P

Markup from Webstorm:

<div id="wrapper" >

    <div id="content-wrapper" class="d-flex flex-column ">
        <!-- Main Content -->
        <div id="content" style="width: 100%;">
            <hr>
            <div class="container-fluid">

                <div class="d-sm-flex align-items-center justify-content-between mb-4">
                    <h1 class="h3 mb-0 text-gray-800">Page Title</h1>
                </div>

                <div class="col-xl col-md mb-4 " >
                    <div class="card shadow h-100 py-2 card-background" >
                        <div class="card-body" style="padding: 0px;">

                            <div class="box-part text-center mt-2 mr-2 mb-2 ml-2 m-3">

                                <form>
                                    <div class="form-row">
                                        <div class="form-group col-md-6">
                                            <label for="inputEmail4">Email</label>
                                            <input type="email" class="form-control" id="inputEmail4">
                                        </div>
                                        <div class="form-group col-md-6">
                                            <label for="inputPassword4">Password</label>
                                            <input type="password" class="form-control" id="inputPassword4">
                                        </div>
                                    </div>
                                    <div class="form-group">
                                        <label for="inputAddress">Address</label>
                                        <input type="text" class="form-control" id="inputAddress" placeholder="1234 Main St">
                                    </div>
                                    <div class="form-group">
                                        <label for="inputAddress2">Address 2</label>
                                        <input type="text" class="form-control" id="inputAddress2" placeholder="Apartment, studio, or floor">
                                    </div>
                                    <div class="form-row">
                                        <div class="form-group col-md-6">
                                            <label for="inputCity">City</label>
                                            <input type="text" class="form-control" id="inputCity">
                                        </div>
                                        <div class="form-group col-md-4">
                                            <label for="inputState">State</label>
                                            <select id="inputState" class="form-control">
                                                <option selected>Choose...</option>
                                                <option>...</option>
                                            </select>
                                        </div>
                                        <div class="form-group col-md-2">
                                            <label for="inputZip">Zip</label>
                                            <input type="text" class="form-control" id="inputZip">
                                        </div>
                                    </div>
                                    <div class="form-group">
                                        <div class="form-check">
                                            <input class="form-check-input" type="checkbox" id="gridCheck">
                                            <label class="form-check-label" for="gridCheck">
                                                Check me out
                                            </label>
                                        </div>
                                    </div>
                                    <button type="submit" class="btn btn-primary">Sign in</button>
                                </form>

                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

</body>