Did you recently change your nameserver to Digital Ocean? It looks like you have DNSSEC enabled for pidforum.org, but the Digital Ocean nameservers are not returning any signatures. Therefore, DNS servers like 8.8.8.8 are detecting the broken chain of trust, and refusing to return the records.
You can see more information using tools like this:
https://dnsviz.net/d/pidforum.org/dnssec/
https://zonemaster.iis.se/en/?resultid=ab6652c87db6b5f9
If you want to disable/modify DNSSEC, you should be able to do that via your domain registrar.
(thanks @supermathie for the tip on DNSSEC - it’s not something I’d investigated before)