Issue with the Timbertex shingles


I am based out of NJ and it came to my attention that the Timbertex shingles that we are installing they have a self sealed adhesive only on one side of the shingle and not across entire shingle.
Can anyone one tell me if its normal or can it be a factory defect? My GAF rep told me that there is noting wrong with the shingles, but once the shingle is being installed on the roof, especially on the high pitch roofs that one side without sealant is lifting up.

That’s normal… That’s the benefit of Timbertex it gives it a more Layered look

This is normal and the way that the Timbertex is made.