This may be worth a try, switch to the normal CDN from the frameworks without minty then swap out this line with this and see if it possibly works correctly.
FROM
<link rel="stylesheet" type="text/css" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
TO
<link rel="stylesheet" type="text/css" href="https://stackpath.bootstrapcdn.com/bootswatch/4.1.3/minty/bootstrap.min.css">
Original topic