Thank you very much for clarifying the issue. I could now reproduce it, and confirming that this is a bug in CBSubs Content plugin. I'm now looking into a fix for release in a nightly CBSubs release soon.

You can track the bug here:
forge.joomlapolis.com/issues/7749

PS. turning on Joomla Debug would have shown the corresponding bug notices.

Ok, problem should be fixed with the latest nightly just released now.

Please backup, then login to Joomlapolis, then upgrade to latest nightly from Community Builder > Plugins > Install plugins > Install from Web.

If it still doesn't work as expected please turn joomla debug on before reporting back. And if it works for you, ... please report back too and enjoy