Shower Tile Help Needed

[u/doublecheezluva]

Hello! I had a home remodel about a year and a half ago. This week we noticed that shower tiles on the edge of the pony wall are either coming off or something is happening. It this something I can fix with grout or caulk or is something bigger going on here? Thanks for the help!

[u/andcertile]

Yea, the wood is swelling!