Hello
I run a campaign since week on revcontent, and each day i see clicks in affiliate network half or third clicks on
today reports

Aff networks always show less clicks, some count unique IPs, some dont count traffic that looks like bots etc ... some just want to have better looking EPCs 
But the difference you are seeing is way too big, but so is the amount of clicks in the screenshot too. Im not sure what kinda traffic it is either, if its some fake bots ... well then its gonna look like this even with more clicks. With legit traffic, the difference is usually 10-20% or so.