A few of our bath tub tiles have become slightly discolored.
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If the tile was professionally done, I would contact that person/company and the maker of the tiles to see what went wrong. They can be replaced. They may even go good for the problem.
Sounds like you have a water problem either in the glazed front or in behind the tile. Here is an article that will explain what it sounds like is happening and the site page to read how to fix/repair the problem. Good luck.
The glaze finish on the face of glazed ceramic tiles is impervious to water; however, if there are undetected cracks in the glaze, water may permeate through these cracks into the tile body (which isn’t glazed). This means that the back of the tile (termed the ‘base’ or the ‘biscuit’ of the tile) can absorb water.
Detecting the problem
The surface of a glazed tile is similar to a semi-transparent glass finish. Should there be moisture ingress into the tile installation, the face of the tile, particularly light-colored ceramic tiles with a transparent glaze, will change color, and appear darker than the surrounding tiles. When this happens you will know that your tiles are exposed to an excess of moisture.
What can cause the problem?
Incorrectly applied grout which is not sealed, or cracks in the grout itself.
https://www.tal.co.za/home/index.php?ipkArticleID=106
What are the tiles made of?
Basic ceramic tiles bought off the shelf at Lowe's.
Most likely a defect in the tile.
Not a water problem. Too random of discoloration. I agree with Janet. Defective tiles. Sometimes tiles are not fired properly at the factory and the back/sides absorb colorant from the thinset or grout. Have the installer remove the tile and replace. Take them back to Lowes. A hand tile saw to remove the grout around the bad tiles and pop/break them out. Shouldn't affect the surrounding tiles. I always buy 10% more material than I need in case of "OOPS".