The fact that the tiles came loose point to a problem with the underlayment or the adhesive application. If you keep stepping on loose tiles, they often will crack. I'd remove the tiles as suggested by removing the grout. Inspect and clean the floor and tile backs. If the floor is soft or moving, it needs to be fixed before installing tiles again. If it is just a case of a poor application of adhesive, then clean both surfaces, reapply correct tile adhesive and reinstall. Grout and be done with it. The fact that two tiles are loose could be an indication of a bigger problem. Be sure all other tiles are tight and the floor under them is is good shape.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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