It only occurs on my new Android tablet: while reading pdf, 10 to 15 mins into it, it would autosave and jump back to the page where I started this session. So, if I opened the file and started at page 48, then it would constantly bring me back forcibly to that point every time it autosaves.
I looked up to see if theres a solution to this, the problem doesn't seem to occur for everyone.

The file, to be sure, doesn't do this when I open it on my iPhone or desktop (MacMini).
It's either I have to disable the autosave feature (which I can't access, it seems?) or reopen the pdf every time I progressed to the next page. I can't really expect to read anything if I had to do this, indeed.