latest gridbox, mobile view column strange behavior

on latest gridbox when I have column for desktop set to 3 + 3 + 3 + 3
and change to mobile portrait it show that column is set to 3 but keep full width when I change to 6 it start using 6, I check it on 3 different site with gridbox installed all works the same way.

Also sometimes when I set that column hide on all except phone horizontal and portrait in some case it show on all view port I have to enable and hide it again to work correctly, also check on few different site with gridbox

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