Competitor has ad prominently mentioning brand X on line 1, with generic widget description on line 2. They don't sell brand X. Clicking the ad lands the user to a page featuring brand Y.
Closer inspection shows that this is pretty common though. At least half the advertisers don't carry the brand either.
It doesn't make much difference one way or the other. Generally, I don't see the brand Xers being swayed. In this niche they will usually want what they want, and not want something else. I quess it's just a surprise to me that I shouldn't find surprising.