I've never heard of a 3-blade mower deck where the center blade is not identical to the outer 2.
And I always overlap at least the mower wheel width that has flattened the grass heads.
A greatly exaggerated deck pitch can create that. I see a fair amount of decks that adjusters brought to the max before hitting then frame won't do 3.5 inches. Though sometimes the front of the deck drops down from a bent front support bracket. Hit enough things and something has to give.