Spooky Sheets Appearing on my Device?

Detailed description of the problem:

I’m really confused here. I don’t have the app installed on my phone (I haven’t for months) but when I go to my file manager, I can see three Google sheets that are titled “Sleep as Android Spreadsheets” that were all created within 2 mins of each other and refer to dates in November. They seem to be locally stored on my phone, not on drive or any other location. What’s the best way to troubleshoot this? I’m super spooked.
Steps to reproduce:

Version of Sleep as Android: