Not updating date

This is a great plugin. I have to create identical weekly events so will be a time saver.

I have set it up to add 7 days onto the selected event. Unfortunately it isn’t doing this and is still displaying the same date. I am using it together with The Events Calendar plugin.

Any tips as to why it might not be working correctly. Thanks

https://ww.wp.xz.cn/plugins/post-duplicator/