Classic Era 1.14.4 PvP Update Schedule

WoW Classic WoW Classic General Discussion
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If you’re in the middle of ranking in WoW Classic Era, you may want to take that timeframe into account before continuing. If you’re about to start ranking a character, you may not have enough time to hit Rank 14 before the patch arrives and your progress is lost…

For example, if you were 90% into Rank 12 on August 15, there’s a high chance you will not be 90% into Rank 12 when you log in on August 22. You may have decayed down to 0% of rank 12 (or close to it).

The maximum amount of CP a player may lose due to decay is 2500 [the same as the old system]. Even if you didn’t PvP at all that week, why would you go from 90% to 0%? I’m confused can anyone explain?