Why does my country-level rule still not match when the step differentiates on port?

Check that the differentiators you ticked on Monitor dwell are the ones you actually want. Every
differentiator you add makes rules more specific, so a rule set at country level will not match if
the step also differentiates on port.

Example
You set a rule at country level, but the step also differentiates on port. Because every differentiator you add makes rules more specific, the country-level rule will not match. Check the differentiators ticked on Monitor dwell and confirm they are the ones you actually want.