Did OINP contact you for additional documents? I read that this can also happen if they were contacting the people behind IELTS/ECA or some other org to verify your information, in which case it goes back to DIP by itself. Maybe you can send them an email or call them if you're not sure.
No they haven't contacted me as of yet, plus I still have my green checkmark. Maybe they're contacting my employer, or like you suggested, ECA/IELTS.
Hope soo.. fingers crossed.. eagerly waiting.. wish you also get approval at earliest
Now its weekend, cant expect on sat and sunday.. hope so next week will be lucky
