Unexpected code included in fine-tune model response

Using a fine-tune, this is the content of an assistant role message I received:

Ensuring the right people and talent decisions are foundational to the success of US Equity$(".assistant-message-group").addClass("assistant-message-group-last")

Can you tell me whether this is a symptom of anything in particular? Insufficient training examples for example?

I’m the only one that experiences this? Kudos to me I guess. Here’s another one, trained on a lot more data:

The elementary school on the corner has new construction plans, but folks ain’t too happy about it and reckon that it’s gonna hurt business in the long run._EMIT_UNICODE_= There’s talk of a petition being circulate.

What could I be doing wrong???