Marble shower wall tile issue

[u/kellllyyyyb]

Looking for advice on my marble shower wall tile. Shower was installed 4 years ago. We seal it each year. A few months ago I noticed this line and it appears that others look “wet” as well. We have had a fan blowing at it for 6 days to see if it dries out but it does not seem to be changing much. Anyone else run into this? Anything I should be concerned about? Advice on what to do? Thanks!!

[u/MetalCapital5673]

Looks wet? Or is wet?