Howsecat - game client reinstalling itself

My game client, which is just normal wow with no classic or expansion, is redownloading itself for the last week at least in the background. It is a new account that I just upgraded from starter. I have tried to delete everything and reinstall fresh, so I don’t think I have logs to e-mail. Just before I reinstalled the client today, I noticed a screen shot of one of my characters on a different server (my character is on Proudmoore server, and the screen shot was taken in duskwook area on The Underbog server) in the screenshots folder, which was very strange. Is the fact that I just upgraded from starter and have no expansion causing this? Why was there a screenshot of my character on a different server? maybe a crossrealm issue? Sorry I don’t have logs.

The client has remained stable for three days since installing it fresh