Check the bisq.properties file for the non-working Bisq instances. There’s a property named bannedSeedNodes. You probably have addressess that are not in the format: [ADDRESS]:[PORT]
You can try changing the format, or perhaps deleting the comma-separated list. I believe the problem stems from here: bisq/DefaultSeedNodeRepository.java at v1.6.2 · bisq-network/bisq · GitHub
The filter checks that the address string is not empty, but it does not check that it’s in the right format. So when the NodeAddress constructor is called the checkArgument fails, as shown here: bisq/NodeAddress.java at v1.6.2 · bisq-network/bisq · GitHub