Dark discolouration on tiles

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Hello,

I have whitish floor tiles in my bathroom and have noticed dark patches/ discolouration that looks like shadowing on the two tiles next to the shower.
The floor tiles were installed before I moved into the house and have been fine for 2.5 years. I have however just had a new shower cubicle installed and since then have noticed the marks.
I’m guessing this could be water underneath from a leak in the shower? My plumber didn’t seem convinced this was the problem but I can’t see what else it could be.
Welcome advice on this!
 

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Dark discolouration on tiles
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Canada Tile Advice
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Created
Squiggs12,
Last reply from
Glynn,
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Created
Squiggs12,
Last reply from
Glynn,
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1,255

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