Does anyone know what those are :

Metal2 > 3um spacing to unrelated m2 < 0.28um (met2.3b)

?

I would not expect this to be a false positive. Do you have a screenshot of an example?

I'll try to re-run it and get one but last time I looked ... there was nothing. Like just some traces parallle next to each other and only 1 error reported (and looking in the DEF they had the right spacing).