Yup. I noticed the same thing on my Slate AX. Use one or the other. I recommend LuCI so you can set a proper .internal domain name. Who doesn't like https://router.freebird.internal?
It'd be nice if GL.iNet tried moving as much as they could from custom scripts to instead make appropriate ucishow/get/set calls/pushes. IDK why they want to recreate the wheel.