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Scilly.Suffolk
Hopefully this makes sense. If the router has for example 3 antennae then by upgrading one you go from having 3 connections on the outer edge of the range to having 1 connection somewhere a bit better(in the pic that's the red one).
Your adapter then goes "great, crank up the speed" and sends all 3 on the new higher speed, 2/3 of traffic goes by the other 2 antennae and now fails so will have to be resent.
Atleast that's my vague understanding of how wifi works.