OpenWrt Luci config

Openwrt luci configs resets to default, over the period of time(3 months) in some units. /rom/etc/config directory is copied to /etc/config without any action. I searched in full unit, there is no script to do this config resets alone.

My installed packages won't get any effect.

Perhaps you are using a dual-boot model?
Otherwise, sounds like a problem with overlay.

Anything useful in the logs?

I'm not using dual boot model.