Have you tried updating the firmware? Also, there was discusion over the multitap issue on the driver thread as well (specifically for the 4 button press events from a single press). It turned out to be a Strybar and not an E1812. But, the issue was resovled with firmware if I recall. In the firmware release notes, they aren't too descriptive. Just "stability improvements"
Firmware Updates for Ikea
[GUIDE] IKEA Firmware Updates?
Start of multi-events registered on the driver page:
[RELEASE] IKEA Zigbee drivers - #298 by jasonbalsor?
Firmware release notes (Ikea)
https://ww8.ikea.com/ikeahomesmart/releasenotes/releasenotes.html
