Such a shame and an utter annoyance. The outboard plate looks to be un level also but that could be the photo.
It's probably a victim of China Syndrome. Massive cost savings on manufacturing bit quality control nets off a chunk of the savings when you unload the pallet and have to sling a percentage of the goods in the bin.
It's such a minor issue and doesn't impact on use but as you say, it's brand new and shouldn't be like that.
Personally, I'd speak to the vendor and explain that it needs to be replaced. You have your statutory right to reject under the 14 day rule. The vendor might prefer to throw some cash back to not have the hassle but I guess the risk is that the vendor argues that he can't get you a replacement until winter. Which is why I'd first cheekily phone up as a new customer and ask if they have them in stock.