Hello Mr. Joost de Valk – I am struggling with a similar issue. I believe I have stripped out all the theme code but am not very expert with this stuff.
this is an example of a page with a meta description written in your plug in tool. https://consiliumglobalbusinessadvisors.com/who_consilium_global/us/principals/ed_marsh/
this is how the plugin titles page is set
Page
Title template:%%title%%
Meta description template:%%excerpt%%
Meta keywords template:
