Coloured Cement Tile Installation Issue - Advice Wanted - Tile Advice

[scarinish]

Hi all,
I am hoping for some professional insight to a recent installation.
We laid client supplied matt coloured cement tiles on a exterior terrace. The tiles being laid on a Schluter Dita drain terrace build up. After a week or so the terrace is still to be fully grouted but the tiles after sealing with a FILA product are changing colour, have a stippled effect on them and generally do not look like the original tiled finish at all. When wet with rainwater they start to return to the original colour, which makes us think possible the sealer has reacted with them in some way. We'd really appreciate any thoughts on this. Thanks,Ross

 

[Dave]

Looks line they’ve bloomed in one pic.
were they left open to the elements (rain) after laying and after sealing ?

 

[scarinish]

Thanks for the replay ! - Yes, I think they would have been left open to rain showers after laying and sealing. One section has been grouted since laying, but there hasn't been any difference in those tiles now.
The plan was to grout the rest of them soon.