Activity Stream gadget not working on a single user filter

Issue Summary

Adding a single user in the filter of the activity stream gadget brings incorrect information.

Steps to Reproduce

1. Create a dashboard
2. Add the activity stream gadget
3. Include a single person in the filter

Expected Results

It should display actions taken only by that single user in chronological order

Actual Results

Actions taken by other users are displayed by the gadget.

Workaround

Include more people in the gadget's filter.