Like counter not updated intermittently on click (fixed after hard refresh)

Steps to reproduce:

1. Go to a page
2. Click on the 'Like' button
3. Click again on the 'Like' button

Expected results:

On step 2 the Like is added and the counter on the Like button increased;
On step 3 the Like is removed and the counter on the Like button decreased accordingly.

Actual result:

The like counter does not update randomly, although the page is liked.
After performing a hard refresh, the counter is displayed correctly.

Please note that this issue appeared after https://jira.xwiki.org/browse/XWIKI-18545 was resolved.