Sheet says I’m not owner anymore and I have to request access?

Pretty much as stated above. On August 1st I was working on my sheet, and then just kept a tab open (not using) over the past 2 days while using my computer for other stuff. All of a sudden today when I go to work on it, it says that I have to request access from the owner, but I am the owner. I haven’t done anything to the sheet in the past 2 days. When I hold down the icon on my phone, the sheet still pops up as a recent file, but when I click on it, it also requests for me to ask for access. I have no idea who could have ownership or what has happened because I am the only person with access to the sheet. It’s not longer in my Drive activity for the edits I’ve made to it, so I am truly stumped, and this is compiled work from over 8 years I may have just lost.