I have a serious problem with underdeliverance of campaigns which are set as 'Contracts'.
The problem is they're seriously underdelivered, e.g. they should have 10000 impressions per day and they get only 6000-7000.
I thought maybe setting one of campaigns as 'Remnant' leaving the rest as 'Contract' would solve the problem, but apparently it didn't, they still get underdelivered.
Remnant campaign, though, got loads of impressions during the same period.
I know for sure that I have amount of impressions daily which is enough for all the campaigns to be delivered, so that'n not a problem either.
So... maybe some of you have any idea what may be causing those underdeliverances? Now I have to manage all of my campaigns manually.