This is Google's policy page around AdWords ads, and while an ad's approval to run is at the Google review team's discretion, we've highlighted a few lines under "Misleading content" that identify the most probable reason for the ads' disapproved status. This was also confirmed with the AdWords support team. It boils down to having a button in the image that can't be clicked like a regular button (Google considers that to be misleading).

This is the main reason our responsive ads were disapproved.