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If your working copy is on a SUBST drive the icons might be mixed up.

The problem arises because the cache tries to fetch the status for two "different" locations at the same time, but those locations are actually the same so there are two status fetchings for the same working copy at the same time.

There is an easy way to solve this:
just exclude the original path from showing overlays (settings->icon overlays->exclude paths).

For example, if you have mapped \\station\folder\wc to g:
then put "\\station\folder\wc*" as the exclude pattern.

(Solution first found by Stefan)