Coins went negative

Why did my daily French coins, which minutes ago were around 60, - just go negative!!! 6:20 a.m. EST, May 29, 2023

These negative numbers will happen and users will have to create enough positive coins to reverse any negatives and complete their streak targets. You get negative coins when you create LingQs from Known words.
When marking words known, you get coins, but if you later click on that same Known word, and create a LingQ of it, your coins get removed, and that is why the number can be negative.

And what if I take two known words and make a phrase out of them? “red”, “hair”, “red hair”

That won’t affect coins status or add negative coins.