This was a manufacturing mistake. The letter can easily be removed, or you can leave it on for when Cirelli inevitably wears an "A" and probably wins a couple Selkes too.
The item "Anthony Cirelli Tampa Bay Lightning Home Blue Adidas Hockey Jersey Size 50 NWT" is in sale since Thursday, August 6, 2020. This item is in the category "Sports Mem, Cards & Fan Shop\Fan Apparel & Souvenirs\Hockey-NHL". The seller is "poundjer" and is located in Toronto. This item can be shipped worldwide.