Period Statistics don't match Progress Chart Values

I’ve noticed that recently (several weeks) the Period Statistics on the progression tab, do not match the values from the Progression Chart or the Fitness Signature Values above the tabs.

For example my current training load in the Progression Chart shows 96, however the value in the Period Statistics (set to year and confirmed to include today’s date) shows 92. Not a huge deal, just kinda curious why these values are no longer the same.