Actually, I looked at the original learned codes for the Sony XM device, they do not repeat, they are always sent only 3 times like all Sony codes, so therefore you would get that effect. I would suggest NOT holding down the button while learning and see if that fixes it (and it doesn't eat all your memory).

This is an easy 1-bit protocol change to the Sony20 protocol, and all the codes are on my site, so it would be really easy to create an upgrade with JP1 that would save a lot of memory, too. JP1 may be the only way to go if the OFA remotes' learning process can detect the 3 repeats and think the whole thing repeats.