In Google Docs, Wordpad, and Writer (for open office), tabs are being "forgotten" or haphazardly "inserted" where other tabs are. I don't think this issue is local to a particular program or file format because in all of the programs I used, I had different formats corresponding to their native file types (Google docs is .gdoc, for example). I also have this occurring with multiple documents. I originally got this issue without tab stops and I have replicated it in files with tab stops, like the ones in the screenshot. The issue was exhibited after re-opening files and not directly after saving them. The issue is exhibited in both converted file formats and original file formats.
This is what the issue looks like:
I've tried all of the generic solutions (restarting the computer, opening/closing various things with task manager, etc.) without effect. Since I know formatting issues can be derived from the type of computer being used and its specs, I have Windows 7 Ultimate (SP1) with an nvidia graphics card on a HP Pavilion pc.
Here is one such file: https://docs.google.com/document/d/12UciH36hJCFQMmbBTBaybxRlcL6946NQcCZCVwOvpwY/edit?usp=sharing. Try editing and saving it after making tabs even, then exit and re-open it and it will probably look messed up (those wildly uneven columns were even when I uploaded it, too).