Hi Andrew,
There is a known issue affecting Skuid in Lightning that currently prevents Chatter feeds from loading in a Page Include. There was another issue affecting Chatter in Skuid pages that was resolved in the most recent maintenance release, 11.1.13. If you’re not updated to that version, I’d recommend testing it thoroughly in a non-critical sandbox, and moving to that version.
As an alternative, the Chatter feed can also easily be brought into the Lightning App Builder as its own native Lightning component, running alongside your Skuid page.
