Node's troubles

Hi, can you please provide clear steps to reproduce the problem?
And add screenshots if possible

The last two screenshots I made from DXPR theme. First screenshot is from Bootstrap activated and DXPR disabled.

Adding a block to the secondary header works fine for me, so unfortunately we cannot reproduce this. Maybe if you can create a video we can see what is wrong, if you create a video please keep the browser console open so that we can see any console errors that pop up.