Mopub - revenue amount was adjusted down by $7?

My revenue for one ad on the 24th January was shown as $7.50 last night and this morning - I just checked it again and it is now showing as only $0.43 with one less impression as well.

I know the figures are never 100% but this is a bit of a jump.

Would like to know if anyone else had this happen to them?:confused: