House was built 3 years ago. In our master bedroom shower, we have stone (which is on top of the shower pan. The stone I believe was in one of those square shower stone tiles.
I am trying to figure out if the grout is going bad or what. I do not want the water going into the shower pan. Looking online, it says grout should last 8-12 years and we are no were near that. Any suggestions on what is going on here, and how to fix? Thanks
(area in question is on the right side of the picture)