Edge of floor coming unglued

Q: We had wood floors installed in our kitchen. They put in a transition piece between the dining room and kitchen. The edge of the wood floor unglued and you can push it down. The company drilled a couple of holes and filled it with glue but it is coming up again.

What can be done to fix this problem?

A: I would think the drill and insert glue method is a good approach. Did they weigh the strip down after doing that? If this is a nail down installation, could they fire a couple of nails through and fill will colour match putty?

Follow-up: No they did not weigh it down and it is not a nail down. It’s in a very open area that is quite noticeable. The company now thinks they will have to take out the transition strip and re-glue the floor underneath.