Mapei Ultracolor Plus grout for Outdoor Porcelain Paving

Joined
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West Midlands
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United Kingdom
I wonder if anyone could advise on the below please.
I purchased the Mapei Ultracolor Manhattan Grey grout after reading all the good reviews on the Screwfix website. I bought 3 x 5kg bags of the Mapei Ultracolor for my outdoor porcelain paving.

I mixed the product exactly as specified and with a paddle mixer. Followed the instructions EXACTLY. Mixed let it set for 3 minutes, mixed again to a nice paste. It was mixed thoroughly, no powder was left behind

A week after applying I am getting what looks like dark staining all over the grout lines.

Initially it looked great but a week on it looks terrible.

Can anyone advise on this at all?
I have attached images of the finished look.
 

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