Problem with alert when no values

Hey guys !
When I have no values for 10 days and I query this : WHEN max() OF query(A, 1s, now) IS BELOW 10 its returning a value !!!
You can find attached some examples.

You you have any ideas !
Thank you

if you have no values for 10 days and you expect values then you have to overwork your logic that is setting the entries. this is not a grafana problem or question