Orange material in grout lines - need help to identify
Looks like schluter ditra waterproofing membrane. 

Amazon describes it:


  This universal underlayment specifically designed for ceramic and stone tile eliminates the main cause of cracking in your tile installation. Tile and stone are rigid materials and are, therefore, sensitive to stresses originating in the sub floor. This uncoupling membrane allows independent movement between the sub floor and the finished surface, thereby neutralizing these stresses. Exclusively designed for ceramic and stone tile Waterproofs and allows moisture in the substrate to evaporate Replaces backerboard or a second layer of plywood 1/8 in. thick makes transitioning to other surfaces simple Ideal for interior and exterior tile and stone installations Easy to install


Below is an image of tile being installed over ditra using thinset mortar. This is as far as your installation progressed. Your floor was not grouted after the tiles were set.

I recommend scrubbing and rinsing thoroughly using a wet vac to remove water. Allow floor to dry well then grout with appropriate product.