Weaver tactical rings don't fit all picatinny rails - Weaver Tactical Four Hole Picatinny Rings

Frustrated with something that was unknown to me about Weaver Tactical Rings is they don't fit all Picatinny rails.
The Tactical cross bolt is three sixteenths across the flats and the regular Weaver Picatinny rings are five thirty seconds across the cross bolt flats, no where that I see in the specifications is anything said about this difference. I don't have the so called Tactical Picatinney rail which I didn't know existed, so couldn't mount my scope rings. Will have to return/order more of the Regular Skeleton rings to mount my scope, so be aware all Picatinney rails are not the same.