A line near the top of the file prevents the chair editor code from running; the UI is poorly designed and was never really meant to be used by anyone other than Cinema developers.

The code Cinema uses for chairs may be overriding the functionality of the sit anywhere mod. I don't plan on fixing this if that's the case, sorry.

I deleted the seat folder and it fixed sit anywhere, only ownside is I have to use sit anywhere to sit on all kinds of seats including the ones previouy allowed in cinema