Correct, it’s not completely empty, but I went from 500+ to 300ish. I’m going around now refollowing people I know I didn’t unfollow. 

I believe the loss of 200ish follows predates my use of the Fountain update. But I’m less sure that’s true of my apparent “refollowing” of people I’d unfollowed. 
I’ve been seeing notes from unfollowed people for the longest time of all these bugs, but it at least hadn’t been claiming anywhere that I was still following them. 

It’s entirely likely it wasn’t Fountain’s fault, I just don’t know what happened, and I think it is the only new client I’ve used. 

The timeline here is so uncertain, sorry!