Hi @anon30216338,
The description: 'A problem or error.'
field is referring to the issuetype
associated to the issue and not the description of the issue itself.
The description of the issue is not provided as part of the event payload, you could retrieve it by using the GET /rest/api/3/issue/{issueIdOrKey}.
Let me also share this earlier related post (JIRA Forge: Trigger Event Description does not match JIRA ticket description) which might help with some troubleshooting if needed.
Caterina