Newbie question concerning mute timings

I’m new to grafana and maybe I am missing something here. I created an alarm which is supposed to fire if my WAN upload falls under 3Mbyte/s. The alarm should only fire once a day and only on mondays and fridays.

I’ve set up an alarm muting and assigned it to the alarm via label. The alarm fires correctly (e.g. on a monday) but then fires again on every other day 24 hours later.

Is there something I overlooked or is this a normal behaviour?

Thanks in advance!