Filter Highlighting Bug in the Activities Section

Expected behavior

Apply certain rules when you open and close the filter activities in the activity section.

Actual behavior

I think it is a bug to emphasize the filter after narrowing and expanding the activity section. Letter do not be highlighted after the area has been expanded.

How to reproduce

Steps to reproduce the bug.

Go to Activity Section. (https://busy.org/activity)
Narrow down and expand the general section in "Filter activities".

Browser: Chrome (63.0.3239.132)
Operating system: Windows 8.1

Recording Of The Bug

Posted on Utopian.io - Rewarding Open Source Contributors