I was using Deco mesh for long time but soon get fraustrated from no fixed wan port and multiple crashes in a single day, i replaced main deco with er7206 now all deco working as AP mode. From that day no more crashes, recently install omada controller on RPI. Now when i see data usage of individual client some show correct and other add extra GB of data.

real usage 1.47/86.9GB

omada calculated 1.38/103.20GB

in ER7206(UN)_V2_2.1.2 Build 20240324 this was much worse (usage 80GB omada show 700GB) so i downgrade the version.

I tested in standalone mode same issue (router webui) seem's like issue in firmware, somehow i was able to figureout after long debugging and testing. this extra data added only when one or two client active usage more than 180Mbps for few minute (isp 300Mbps) in that period pseudo data was added and if i see data data port stats its show same as real usage.

meanwhile ui port stats show correct data but client stats add extra data.