MP, best hand south, pro GIB 32.
It may be that nothing went wrong here. If it did go wrong it was subtle.
The truncated explanation of the redouble is that the opponents cannot be permitted to play undoubled below 2N.
Accordingly a pass by South instead of X of 2H would have been forcing. That being the case, I would expect X to be strongly suggestive of taking a penalty (what's with the "2+ Hearts"?), over which I question North's decision to pull it.
Before the results merchants point it out, I acknowledge that 3N+1 scores better than 2HX-2. But I wonder whether North got lucky in deciding to pull. Perhaps South's X is bad? But then it seems that North understood the X perfectly if deciding to go for the game our way.

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ing) tr. v. - Any bid made by bridge player with which partner disagrees.