What does the Activity column exactly refer to?

Thanks. But even if we consider that, for Carry Forward Responses, the Activity should’ve been Jul 29 (for the Listed action), not Jun 25. And the Activity exactly matches the last edit by a user other than me, not those small actions. Hope this clarifies.

And I assume by “deleting those small actions”, you mean if I delete those, from that moment on, edits on the first posts will affect the Activity. Please let me know if I misunderstood you.