different suppliers have different 'quality control' requirements- it's Joannes--not F&P's
even though it's their brand- if you bought the same pins from their store they would be different (better) than the ones you will find in 'big-box' stores- it's that way with everything that is manufactured-and sold in numerous markets.
example- (i used to work for a lighting company) we would have an order for a certain light globe for Macy's- the quality spec said we could have (1-bubble) per 6"space for it to pass-
the same light globe order for walmart the spec was (6-bubbles) per 1"!!! so if the run was not going well and we were getting lots of bubbles- those parts could be set aside to fill the walmart order- but they did not 'measure up' for the Macy's order- its that way with most manufactured items--that's why you find the same things at so many different prices-it may say it's the same item- but it is not- the item may be made with the same mold- or what ever- but each distributer has their own set of (quality measures they accept)