I have exactly the same question like here, but the answer cannot be found there..
https://compojoom.com/forum/102-newbie-area/21094-meta-description-not-showing-for-matukio-eventlist

Shortly, in a menu assignment I've set up Meta description and Meta keywords under the "Metadata" tab. They seem to have no effect, as always the global keywords and description are shown.

Could you please advice?

Thanks,
Marci