Facebook pixel catalog problem with DYNAMIC ADS

Hi there. We are facing a serious issue with our facebook pixel and in particular the DYNAMIC ADS. At this point we are using Shopify's integration method for the pixel and we can’t figure out what is wrong with the products matching the events. Our problem is this: Although events fire up perfectly, ALL EVENTS could not be matched to the content ID's in our catalog (we have used flexify as a product source) therefore we couldn’t run dynamic ads on these events until yesterday. Although we changed nothing in the pixel code or the catalog IDs or the events even, all events started matching to the catalog for no reason yesterday. Don’t know what will happen with tomorrows events. But all the events of the PAST DAYS can't be matched with catalog products (view images). At this point I should tell you that I have observed this: Flexify inserts the Content ID in the Group ID of the product. Until yesterday we thought that was causing the mismatch. But the catalog still has the content IDs in the group IDs (nothing changed) and the events of yesterday match. But we can’t use all the previous events for dynamic ads. And that is our goal. At this point it is important for us to retarget the past events and also make sure any future events are correctly matched to the catalog IDs. Do you have any idea what might be going on here?