Neutered male cats will still be in heat, but they will not be able to give birth. Even if it is in estrus, a male cat will not have any reproductive behavior because its reproductive system has been sterilized.
Male cats are still in estrus after sterilization, maybe because the hormones in the body have not completely faded away , after the cat has finished this estrus, the hormones will slowly fade away and it will no longer be in estrus.
If the owner is very worried about the cat’s estrus, he can use anti-estrus powder on the cat to get through this estrus.
The male cat was not completely sterilized, and the doctor only removed one egg. It is possible that you need to go to the hospital for examination.