UPDATE:
They released Graylog 4.2.1 which includes the following fixes that resolved my issue:
- Fix issue where the first day on the traffic graph didn’t show the full day traffic value
- Add timezone setting to PaloAlto inputs to fix timestamp parsing
I updated, rebooted, and BOOM everything looks like it should just like it did on Graylog 4.0
I knew it was a bug… (>.>) (^_^)/