The voting has been closed on 3rd March, and I haven't found anyone else with similar activity. However, there was few more entries from ineligible forum members. All of those posts are deleted now, but some of those ineligible voters has received merits.

Simply they were trying to receive merits. Those votes will not be counted (based on the rules), and they aren't going to be picked for the prizes draw. Those users has successfully received merit from their voting posts. User preikaler is a great example of those abusers.