Homey’s Zigbee implementation doesn’t have a user interface to remove devices from groups.
The issue seems to be caused by the IKEA remote (sending all messages to a particular group by default) and not so much the Aqara device, and this suggests that if you install the latest firmware on the IKEA remote the issue may be resolved (but if you use your remotes to also control other IKEA devices you may lose that functionality).
You can also try and contact the maker of the IKEA app, Athom, and hope that they understand the issue and implement a similar solution as what zigbee2mqtt did.
