Markers in graph

I set an alert in my graph (in my case when the value is >10), still I get more markers in my graph (how do I switch these off BTW?) at strange locations, like “PENDING” @ value 4.4 and a few points later “OK” @ 4.2…
How is that possible?

Anyone who can help here? Can I switch off the markers but keep the alarm?
As you can see, it’s quite irritating (and I believe there’s no reason for all these alarms)