We're running an internal migration of all old players' stats to our new highly advanced statistics tracking backend. This means that stat changes will be a bit delayed while we ingest this huge backlog of data. Nothing is being lost, it'll just take a bit longer to show up in the in-game UIs.
Join 1.9 PvP you can play 1.8 PvP
Also if you want to make a suggestion post it here: https://www.cubecraft.net/forums/suggestions/create-thread