for the 3 hours gap they will be inverted, if not the time gap will be 9 hours in some of then
That's not inverted. The inverse of 3 hours behind would be 3 hours ahead. And don't let the rows surrounding midnight confuse you; this chart shows GMT as either 3 hours behind or 21 hours ahead for all rows.
yeah, what that picture shows is PDT and EDT, not PDT and GMT. The PDT would have to switch columns also, for EDT and PDT to be shown accurately.