Gmail is possessed

[Ihazterbo]

I use gmail and I can delete the emails I don't want and 10 seconds later they are reloading back again as if I never deleted them. So I'm deleting the same emails no less than 3 times before they truly delete into the trash. Anyone else ever have this happen?
Not sure if it matters but it's a Samsung Galaxy S5. My S5 Active became so laggy after the last update it took longer than 45 seconds to load an app or google.