Weatherstrip question

I searched but didn't really see the answer I was looking for. The rear weatherstrip that goes around the rear opening and seals the liftgate keeps popping off on the bottom. The last shop that worked on the liftgate removed it and I see what appears to be grease or something in the channel that attaches to the car. I'm guessing this isn't right? It's going back to a third shop next Monday for all new parts (liftgate, glass, etc). Starting from square one to try to fix it right. Just curious if it's normal for that weatherstrip to pop off so easily.

 

No

 

The weather strip is coming off the rear doors of my 2012 4Runner...it just doesnt stay in place and I havent added any stick to it yet.