Vlad
This is yet another one of those painful bugs that are difficult to consistently reproduce.
For me, one of my profiles seems to suffer from it significantly more. In the video below, I open two new tabs from my bookmarks bar: https://www.youtube.com and https://www.kahoot.com and both of them consistently have their top part being covered by Orion's toolbar. Frustratingly, following the exact same steps on a fresh profile does not result in the same behavior.
While testing, I also noticed that when I click-and-hold on the toolbar on Version 0.99.127.2.2-rc (WebKit 619.1.1), the cursor changes into an i-cursor yet no text can be selected. This could be related to the bug at hand. I was unable to reproduce this on the latest beta.