Moving scrollbar downward through click translates modal along y-axis

Question

I am using bootstrap image gallery to display images on my website. I have added an extra column for comments (with scrollbar) so that users may comment on photo.

Probelm:

When i click on scroll-bar to scroll, whole modal move downwards/upwards due to css transform style applied on slide ( cannot find js code from where this style is appended ).

Here is a code of each slide

<div class="slide" data-index="0" style="width: 1366px; left: 0px; 
transition-duration: 0ms; transform: translate(0px, 0px) translateZ(0px);"> 
<...Modal Code ...>

Any suggestions how to overcome ....

jsfiddle