ZoneAlarm is not well liked, and seems to have a lot of problems with a lot of different hardware and software. It has no corresponding virtues. It will continue to interfere even when supposedly disabled, so you have to uninstall it to get it to quit.
You have a firmware firewall in the router. That’s really all you need in the way of a firewall. People who run multiple firewalls usually get them to fall over each other.