Hey guys,
So we've had our engineered, white-oak, floating over concrete floor for a few month now. The floor look great and we are loving it. I'm noticing a few places where the plank ends have moved away from each-other every so slightly (the buts, not length wise). It's not bad, but not as tight as it used to be after the install. I know they could be tightened up by removing the baseboard and tapping with a pullbar, but I just wanted to see if this is something common and we shouldn't worry too much about it or if it is not normal.
The gaps are really not big, but compared to time right after the install - they have definitely increased.

Thanks al

Could be a little memory with the adhesive. If you let the adhesive set up a tad long and slide the ends in place to far they will rebound on ya..

Thank you for a reply!

The floor is a click system (Carriage House, White oak) , and i'm thinking of putting a bit of T&G glue and tap/force them together and see if it takes. What do you think?

Carriage House is an excellent product. There's a few qwerks to be aware of when installing it, so not to run into this problem.

1) Start with tongue side against the wall, (cut off the tongue against the wall, and allow for expansion).
2) Install from left to right.
Place long side tongue into groove at a 20-30% angle. Here's the key...In this position the end joint must be aligned between 2 points of the interlocking system. If it's too tight you bust off the top of the end t&g profile when pressing down on the length side, and tapping the end. If the end is aligned too loose...The bottom part of the end t&g profile will bust, when tapping the end tight. Either scenario will result in an end joint that's not locked in place. With the movement of a floating installation, even minute, your going to get end joint gapping.

Your idea of the t&g glue will solve the problem. Just be careful when tapping that you dont "hydraulic" the end joints of adjoining planks, creating gaps. After gluing and tightening a joint, I would hold the seam together with some blue tape until glue set. Blue tape holds the world together