That's a complicated expression.
I suggest you paste the whole expression into the promql browser (i.e.
prometheus port 9090) and look at the graph. If you see gaps in the graph,
that's where the expression does not have any value, and that's where the
alert is getting resolved.
Note that while you can configure prometheus to require an alert to be
firing for a certain amount of time before generating an alert ("for: 5m"),
you cannot configure it for an alert to be *not firing* for a certain
amount of time before it is resolved. As soon as your expression does not
generate a value, even for one evaluation cycle, it will be considered
resolved.
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