Invalid attributes, anyone else?

On one of my listings today, the same listing I’ve had for about a year, in which I only change price, it’s suddenly saying invalid attribute for count value. It’s a 3 count, so the value is 3.0 and the drop-down is “count.” Which is the only available attribute actually.

In the old value it says 3.0 and Count with a capital C but the drop-down has lower case. I’ve tried entering it manually, no. And tried changing value to just 3, no.

Maddening ridiculous nonsense. This is an amazons choice listing and it’s been fine until today!