These are turning up on occasion. Bicycle Quarterly reviewed one a few years ago which became comically lopsided after (IIRC) 2000 miles.

Some folks are claiming that Brooks quality control is not what it used to be. I am among those folks, but others argue that we are incorrect. I don't remember this sort of thing "back in the day" but of course we didn't have the internet back then either, so maybe it always happened and we just didn't hear about it.

At any rate, Brooks still seem to stand behind their product. If you are sure that it is the saddle itself then you can put in for a replacement and be fairly confident of satisfaction.