Wetroom floor tiles dipping and grout is orange after one use

Grout discolouration normally occurs when the adhesive hasn't fully set, the moisture left in the adhesive is being drawn out through the grout which causes it to discolour. Cracking would suggest there's been movement, which again could be down to the adhesive not being set completely. A simple fix would be to rake out the discoloured area and regrout it.

Hi, without knowing what is underneath the floor tiles then it is probably reasonable to assume that you have movement within the floor thus causing cracking. However cracking in grout can occur anywhere where wall and floor tiles are due to shrinkage (contraction) after a bathroom remodel. Best to rake out and replace. Also, flexible grout for wooden floors must be used and buy the best one regardless of the price. If there is an orange tint on the tiles/grout then that suggests it is the remnants of soap/shampoo which usually leave an orange taint if not washed away completely. If the drain off to the floor isn't nigh on perfect then you will get water pooling and discoloured deposits to the tiles and grout from the pooling. I always use a wet room tray such as Jackoboard to ensure a perfect drain off. Best wishes.