the ranking system is really strange and really difficult to understand.
It makes more sense, when you look at it long term rather than short term. You could now pick a few teams (such as your league mates) and put their current status (world and country rank, league record, Cup) on paper - and then check the same teams in a season. World ranks are pretty much impossible to figure out unless you are near the top of the list and participate in B3. Focus on country ranks.