Wednesday rides in SSB MV2

I just started SSB MV2 and noticed that the Wednesday endurance rides are not consistent. My endurance PL is 4.4. The Wednesday rides starting week 1 have PLs of 4.3, 4.2, 1.2, 4.3, 1.5. I am confused as to why they are set up this way and was wondering if anyone else had noticed this.