This can be seen for the second pair of coordinates with the fill command. The options are sorted in the wrong order. Pressing tab multiple times you will get the following, in order:

/fill x1 y1 z1 x2 y2
/fill x1 y1 z1 x2
/fill x1 y1 z1 x2 y2 z2

It's just 1.17 now

Well in 1.17 versons they've added an option to stop AdvancedChat from changing order of command suggestions. idk if this option is present in 1.16 versions tough (maybe isn't cuz I couldn't find)

Archiving for modules https://github.com/DarkKronicle/AdvancedChatCore/wiki/Modules-List