PA0PBZ: thanks a lot for your ideas, with your help I was able to solve it.
First things first and because I also want to leave something here for the next person who has this problem:
This is how to bind and unbind.
(1) remote control learning: learning button LED light into learning mode, press any button LED flash three times normally on later, said learning success and wait for a remote control;
(2) remote delete: executable when lost or new remote control remote control after the first remove the learning process, hold down the learning button for 8 seconds, the LED under the slow flash 5 said all the ID of the remote control, if you want to learn do the remote control function.As to how I solved it, I honestly cannot explain it. After reading what you wrote, I unbinded the first receiver and suddenly only one of the remotes worked with the other receiver. Then I paired the receiver again with the remote that was not working for the other receiver and all started working, each remote now just works on one of the receivers.
Drew it up, maybe it could help someone: