Reproducible in hosts, template and their items, triggers, discovery rules - basically everywhere where you can filter a list without reloading the whole list. 

Steps to reproduce:

1. Check 2 checkboxes in Discovery rules list
2. In the filter section click Status -> Enabled
3. Click Apply
4. In the filtered list check another checkbox
5. Click Back on your browser

Result: the list has 3 checkboxes checked, but only one highlighted (the one we checked last) and the count says "1 selected"

Expected: the count should match the actually checked checkbox count and all checked rows should be highlighted