You form the redeem script from the pubkeys. With 3 public keys, there are 6 different permutations. Each of them leads to a different multi-sig address.
Interestingly, none of them matches the one you need.
- 123 3R1UQV2dHeXN2S3fiUqzFZnKougMdyEYv9
- 213 37yynZQMVYP2c7aU3MMQuRNT35Ef4n7gMA
- 132 36Dpfp5JqZXnkRQE6QTCRPxUmsbp9iQVSR
- 231 3DYmesQmQF5LrYG948bQfsuK7J9waZ9ZyG
- 312 36zHiQfWSnWVeLXSY9qGqHTXqCLad1Qdyk
- 321 3Lc3xpDc2TGgr4PukALsa4GMXvK69fA76h"
Either you are trying to redeem from the wrong address, or you don't have the right pubkeys.
This does seem to accurately identify the problem. I will start looking to see if I can find the cause.
Edit: The problem has been solved, thanks to the information from hhanh00! The indices being used to derive public keys from master keys were out of order in one location, which resulted in the wrong public keys being used.
