Tire Size Wrong?

I have a 2015 Ford Fusion SE and the door sticker calls for 225/50R17. Three local tire shops have told me the trim model calls for a 235/50R17 and have told me the reason why my last two sets of tires have went bald in the middle of the tire before the outside of the tire is because I’m putting the wrong size tires on. If the door sticker calls for 225/50 why would every online tool I use to find the proper tire size say 235/50? Is the door sticker wrong? Any help is appreciated.

I have a 2015 Ford Fusion SE and the door sticker calls for 225/50R17. Three local tire shops have told me the trim model calls for a 235/50R17 and have told me the reason why my last two sets of tires have went bald in the middle of the tire before the outside of the tire is because I’m putting the wrong size tires on. If the door sticker calls for 225/50 why would every online tool I use to find the proper tire size say 235/50? Is the door sticker wrong? Any help is appreciated.