Plugin does not work on subside with multisite

Hi there,

seems like the Plugin won’t work on the subsite. I already tried to activate it in the network for all pages and also to activate it on each page seperatly. It says it’s activatet on the subsite but it isn’t working.

Is there a fix for this?
I really don’t know what to do anymore!

Thanks!

https://ww.wp.xz.cn/plugins/simple-custom-post-order/