Google Adsense' reports are currently down. It has been reported by 20+ users on the Adsense support forums in the last few hours. It is not immediately clear whether just the reports are down or if the clicks aren't actually being recorded by Google Adsense.
|Web Reports - Adsense Reports as of 26th Jan 2017|
IOS Adsense App screenshot:
Reports on Adsense Help Forums
Visit the Google Adsense Support forums here: https://productforums.google.com/forum/#!forum/adsense