Improper behavior of the User Administration section

STEPS TO REPRODUCE

1. Login as Admin
2. Go to Drawer > Administer Wiki > Users & Rights > Users
3. Click 'Edit' for Admin profile
4. Click 'Cancel'
5. Select 'Edit' again
6. Observe the 'ABOUT' and 'ADDRESS' sections
7. Click 'Cancel'
8. Observe the 'Results per page' drop-down box from above the livetable
9. Create an user (e.g. U1)
10. Click 'Edit' for U1's profile
11. Refresh the page
12. Click 'Edit' again for U1's profile
13. Click 'Cancel'
14. Repeat the 'Edit' > 'Cancel' several times for U1's profile
15. Observe the 'Results per page' drop-down box from above the livetable

EXPECTED RESULTS

The sections from 'Edit user' modal (both for Admin and for the user) and the 'Results per page' drop-down box are displayed properly after each action.

ACTUAL RESULTS

When the 'Edit user' modal for Admin is opened the second time (and every time after that), the 'ABOUT' and 'ADDRESS' sections are displayed twice (but only the information inserted in the upper duplicate sections is saved). Also, 'Results per page' drop-down box from above the livetable is duplicated. If the page is refreshed, everything goes back to normal.

However, the sections from 'Edit user' modal for U1 are displayed fine, but when this modal is opened each time, the 'Results per page' drop-down box from above the livetable is multiplied (screenshot attached) until refresh of the page.