Ads loading and playing give no reward today. What's up with that?

[axd23]

Only 13 green packs today instead of 21 (I use the other 4 ads for x2 training).

Not because of lack of free offers but because after watching the ads I didn't receive any reward in 8 different cases.

I don't mean to sound ungrateful for something we get for free but come on, this is a scam.

Do we have any explanation?