@Eric21 my understanding is that those utilisation figures are the utilisation of the channel from all sources, not just your Meraki access points. That’s not to say that there isn’t a problem with the APs, but it could also be some other RF source in your environment - malicious, or otherwise.
What you could try and do is move those APs to different channels and see if it goes away, or continues. If you’ve manually selected the channels then adjust them, or if you’ve got auto-channel selection on then remove those channels from the auto selection to see if it changes things.