My template is giving me some trouble with the edit item modal/popup window.
It loads the item edit window as a parent. I thought of adding target="_blank". This works fine but for some reason the scrollbar doesn't get loaded.

I've tried these options but they both don't give a scrollbar in the new window of Chrome.

Some help would be very much appreciated.

Does the link open in a new window or within a modal (Joomla!'s default) modal?

Furthermore It is most likely a template issue with an overflow: hidden present.
Did you consult the template's developer about this issue?

Inside template.css of my Joomla Template there was this:

body {
background: #FFF;
font-size: 14px;
line-height: 24px;
color: #2e1736;
overflow: hidden;
}

I changed it to

body {
background: #FFF;
font-size: 14px;
line-height: 24px;
color: #2e1736;
overflow: auto;
}

and

@media (max-width: 979px) {
body {
overflow: hidden;
}

to

@media (max-width: 979px) {
body {
overflow: auto;
}

I still have the problem of the class="modal" that is being used by both bootstrap.min.css and k2.css.

Atleast this was a way around it for me.

www.joomlaworks.net/forum/k2-en/35289-solved-k2-and-ja-purity-iii-compatible?start=10

This post will help you solve the issue.