No, it must be something else. Did you use /system backup save on one 4011, copy the file to the other one, and use /system backup restore there? If so, you have cloned the MAC addresses, so no wonder only one router works at a time.
export an import would not, so the issue is something else. The easiest way to describe the configurations is to post exports from all three devices, see my automatic signature for obfuscation hints.