Random code at the end of description

I have a question. Never had problem with it earlier. Haven’t been using API for some time recently. (last was when 3.5 was new).

However, I asked GPT to standarize descriptions of machines for me.
It takes around 1-2m to create one description… 1st,2nd is good… and then it starts appending some random characters and code. Out of nowhere… then again it is good again.

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For now I’m using chat GPT page. Seems API returns random data from time to time.
I don’t mind paying for API. But for every 20$ spent, ~15$ returns trash at the end.
When I copy/paste prompts to page it works good.