caption is move down approx. 10pх per swipe

[mplusb]

i have a new interesting bug with mobile version
If you try to swipe opened in fancy-box picture left or right, bottom line of background with caption is move down approx. 10pх per swipe.
Screenshot:

On desktop all is OK, but the problem is reproduced by trying to drag-and-drop opened picture. You can see it only with such a window width, when to the right and left of the picture there is no empty space to the edge of the browser window.

https://wordpress.org/support/topic/problem-with-total-width-of-page/

[Technotika]

Here you can see some problem with other site with other theme:
https://wohnmobil-reiseberichte.de/cote-dazur-und-provence-teil-1