Weird prototype preview

[tank666]

Prototype is distorted/glitched in presentation mode

I am doing some Usertesting, most of the other tests when perfectly. But with this one user the prototype is stretched and squashed. As shown in the picture below. (The red squares are covers) You can even see the blue interaction box are offset from their original position. Is this a known bug? Is there a fix for it? [Screenshot 2021-02-04 at 10.35.27]