RE: Mystery Random Upvotes

Looking at the voting patterns on both posts you voted on, it seems that :

• Your votes aren't from following a trail
• The two accounts are linked and receive exactly the same votes from the same voters

So my opinion is : there's a compromised app in there, and the authors you upvoted are linked with this fraudulent app.

So best would be : revoke all access / change your keys.
And then authorize back only the apps you use and have trust in.