Dhtmlx timeline problem with last square


I start to implemented a first prototype with timeline.js and I have a problem with scroll/header and the insert of a element in the last square.
If I go to the last square, I see only a half of the square and this is not complete.
This my doubt, why the last square is not all visible??

See the attachment

If I insert an element in this square the scrollbar go down but if I go up a part of my header is not visible.
I use like css

html, body { height: 100%; padding: 0px; margin: 0px; overflow:hidden; }


The issue isn’t reproduced in all our samples with Timeline view:

Seems it is related to the configurations in your app. To help me understand the cause, please reproduce the issue using DHTMLX snippet system and share the link. Then I’ll try to help you find a solution.