What the frak is going on with my Gmail account?

All of a sudden, I’m getting a ton of old emails popping up in my inbox and my spam folder. When I signed off yesterday, I had about 150 emails in my inbox, and zero in my spam folder. When I got back on last night, I had 2300+ emails in my inbox, and 600+ in spam. Looking at the spam, it goes back to at least May. I clear it out every day, and gmail says it will automatically delete spam after 30 days anyway, so why is this happening?

I’ve cleared the spam folder multiple times since I signed on, and it just keeps pouring in. What the hell?