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It's the glue. Usually indicates not the best glue job. Chinese players typically only brush their glue on in one direction, from the bottom to the top, so if the glue isn't applied very evenly then there'll be vertical streaks visible under certain lighting conditions.
Some folks are really strict about the bottom to top method, but some would spread the glue out in a circular or random fashion first before evening out the glue in bottom to top. This is difficult to do when regluing rubbers, as the best way to get things even is using a lot of glue, but then the glue spills over the edge. That's usually not an issue for CNT members since they never reglue, so the edges are always on a new rubber and they just get cut away. So it's a bit embarrassing that WCQ's rubber looks like that.
I also heard that the tier 1 CNT players change their rubbers so often that they have someone else glueing the rubbers for them.