Orange marks on my grouted projects?

[OhMyNord]

So I've started building a bridge for my dragon tank and as I was letting the grout dry overnight it seems to have orange patches on it? Is this still safe or should I chip off the grout and start again?

 

[Scion19801]

Pics would help to better see the issue, if you can post some. Look up at the bar under the site banner to user image uploader if you new to site and need help.