There was time when Bitcointalk.org forum had several bugs in merit system after its kick-off but it has been years without any bugs reported since then. Today is a first time after many years, there is a report on merit system bug, and I guess theymos did something behind the scene for changing merit system or it is technical things from somewhere else. I am keen on a first assumption but let's wait for theymos to appear and confirm his changes, tests or anything else.
It's actually gone, those are just cached.
Possibly changes are coming on merit sources as I am not a merit source and my merit stat page is well, no negative merit or sendable merit.