Your original HDSeed's keystore was flushed with the wallet encryption, then if you generated new addresses to receive those missing transactions, then that's the issue.
In this case, the solution is to find a backup of that encrypted wallet file.
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You reason but, I saw a wiki, the encrypted wallet does not modify Hdseed! It's true ?


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Earlier you mentioned "then I reverted to the original". Without knowing what exaclty you did, i would speculate you failed to revert modification you made.
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I modified a letter, to put it back in its place, it's a test!
I just changed the creation date of my wallet

if I have a backup or a "pywallet recovery" or a dumpwallet of my file, before encryption, it may seem stupid, "BUT HOW TO PROCEED"? Please !?
What is the problem ? problematic ?