I think it would make sense to only enqueue the formbricks-admin.css stylesheet on the formbricks pages in the backend.
It's affecting 3rd party plugins styling, specifically this CSS which applies to every single text input:
/* Style for the input fields */
input[type="text"] {
width: 50%;
padding: 8px;
margin-top: 8px;
box-sizing: border-box;
}