I’m pulling my hair on this one! 
I have an app using only groups instead of pages, like a native app. Page index is set to fixed-width (320 x 640). You choose group to show in a menu, the group being displayed right under the header:

The strange thing is that one of the groups will only show part of it’s content and not at the position set in the Bubble editor, but instead at X = 0, Y = 0):


But, after clicking “Show responsive boxes” in the debugger, the group is shown with all data and at the right X and Y:
Are you testing in safari by any chance?
Yes! Both on Mac and iPhone. But Also Google Inbox on Mac.
I tried to remove the group containing the part not shown, and tada, all is well. But I have nested groups on other main groups that is working…?!
Ok, because on Safari there is a known display issue with groups that are conditionally hidden/shown.
If you search you’ll find a long thread about it (sorry I’m on the run so I don’t have time to find it right now). But if you see it in Chrome as well, it might be something else… 
Sorry for not finding that thread in the first place! I didn’t consider a Safari bug. 
It works in Chrome, but not in Google Inbox - could it be using Safari as a web browser.
Thnx @pnodseth. My hair can now grow back. 