Issue Installed 18.0.55 but again appears as available to install

[KirkM]

i did not have the psa-firewall.service but had the psa-firewall (i assume it is table or something)
that removed with dnf remove psa-firewall.
plesk-firewal.service was still there (it is the new name after 18.0.53 i think) so iptables was safe.

OK, that would make sense. Some sort of conflict caused by the old psa-firewall still being there. That would explain why I didn't lose my current firewall. Glad it is all sorted out.