modal_window issue

After upgrading to 2.4.3 Highend version, modals windows aren’t shown and in the address bar an # sign after page name. Lateral scrolling bar dissapears.

We have customized modal_windows css:

#main-wrapper .modal-open {
text-transform: none;
padding: 1px 5px;
font-size: 12px;
line-height: 1.5;
border-radius: 3px;
background-color: #5472d2;
box-shadow:none;
}

Some clues?