The version you are running is not supported here because it is materially different than the official OpenWrt.
There are two options here:
- if you want to continue to run the GL-Inet fork, there is a forum that they host for users to get support and discuss their issues.
- alternatively, you can run official OpenWrt (currently supported in snapshot only)... in that case, we can help you here.
That said, @dannil seems to confirm that your issue is a known bug, so running the official OpenWrt version won't help you with this particular problem. But it is possible that the resolution will be available on official OpenWrt snapshot sooner than it will appear in the Gl-inet firmware.