We recently had a issue if the form has lots of views  and any kind of popup is displayed, if you try to drag it the popup will scroll to the bottom.

This issue seems to be resolved according to https://bugs.jqueryui.com/ticket/9315 but still present in K2 4.7, K2 5.0 and 5.1

We have logged this issue with K2 for a fix but for the time being the workaround for now is to simply add the following CSS in a Literal Data Label expression on form initialize rule.

<style>html, body, form{ position:relative!important; }</style>

Regards,

Satpal