Per chance, does that happen when loading specific bookmarks?

If so, look at the URL to see if there is an m in the URL to load the "mobile" version of the webpage.

yes old bookmarks open in desktop mode but actual entres by my typing - open in mobile mode againe /google gmail/ - for example in footer of page @google@ I switched to full version [it load short quick version of desktop ] but in next step it switched to mobile againe (not save my choice)

and m. at begining string it inputed automaticaly

should n't help delete all hystory and bookmarks?