ELO and changes Underway at SimplyBG 2023

[Pete D]

Question about the ELOs I see in my 'Play Statistics'. I see an ELO of 1677 for 'Match-Play of any length with or/wo cube w/Crawford rule'. I see an ELO of 1543 for 'Match-Play of any length with or/wo cube with or/wo timer'. Lastly, I see an ELO of 1542 for 'Match-Play w/Crawford rule'. Apart from a couple of money games, and one with a timer, every match I have ever played has been with cube and Crawford rule. So why the large disparity between these categories of match? The two categories with the lower ELO do not appear to exclude any of my many matches, so I don't understand why they show a much lower ELO than the first category.
Thanks!