Triggered events with custom dimensions set, but Google export does not have dimensions

I have a website that uses GA. It does the following:

- Initialize chunk of GA
- Isogram script


I find that in the test environment, or in the local settings, this page fires the pageview event with cd1 configured.

however, on the internet, we have many events where cd1 is not configured.

I have analyzed the data and cannot find any pattern for the events where cd1 is missing. It is not specific to a browser or device.

It was also not played on our local machine.

Any idea what could be causing this? or … any suggestions on how we can get to a root cause?