The farmer prompts for a reward, but the wallet has not increased and transaction records cannot be found!

2023-11-22T15:40:59.225603Z INFO single_disk_farm{disk_farm_index=3}: subspace_farmer::reward_signing: Successfully signed reward hash 0x82b366fecd554e741c77d667ffd7cdb0360d9f1a8556577acea8abf6884d2612

It has happened many times. May I ask what is the reason for this?

How do you check rewards? You probably look at explorer for a different version of the network.

It is possible that not all rewards will be included due to reorgs (see Сoin disappeared from wallet balance - #2 by Diana_Subspace), but with several it is more likely that you did get something.