Skeptic23, welcome to the club. ) It appears to be rather serious problem, with a few earlier (than mine) reports:

Scrolling with keyboard through document and binder with keyboard arrow keys works as expected with Scrivenings mode off. With Scrivenings mode on: 1. Inside Scrivenings mode. Say you have 5 text documents inside a folder which have all been displayed correctly in scrivenings mode, if you press the down (or up keys) to scroll across the entire text, at each break between text documents the document will switch to the very end of the series of documents, if you press the down or up keys again …
If I have a folder, and within the folder are documents, and I click the folder to be able to go through all of the documents in the folder at once. If I start typing anywhere in the documents themselves, the cursor will bounce around all over the place and I will drop random letters all over my manuscript if I’m not paying attention. To edit the documents, I have to go into the individual documents within the folder.

Hi, the issue is reproducible on my PC. create a new project add at least two new texts switch to Scrivening mode, so both texts will appear (text 1 above text 2) move cursor to text 2, hit enter -> cursor will jump to text 1 (first scrivening) Thanks for looking into it! Philipp
…it was even reported as solved in Beta 23, but apparently has not yet.
I believe all our detailed reports, even if repetitive, will help the developers to fix this.