OU tends to be very lenient in Kashrus supervision.
Example: The nearly 1,000 (!!!) Milchig coffee creamers that they certify are labeled NON-Dairy in large letters (based on some government rule), but the casein (cheese) ingredient is listed in fine print.
I have queried them on this, but have gotten evasive replies.
My Posek says this is a serious issue!!!