I checked your collection on OpenSea. From what I can see the items with the blue tick, are items associated to the “Decentraland Wearables (Polygon)” collection. But latest items are associated to a collection named the same as the one created on DCL, for example this “I did it first Meta Skate Drip” collection.
The blue tick is associated with the collection (mean “verified collection”) so my doubt is: is there anyone who has the blue tick on a collection of him?
Because if there is no one, then how DCL works has changed, before probably all the items ended up in the collections “Decentraland Wearables” instead now, for each collection on DCL, a collection is created also on OpenSea.