Steps to reproduce the issue

In Joomla 4.4.4, go to the panel administrator, modify all the "bootstrap size" modules (in advanced tab) to have these positions :

[ module size 12 ] => 1 full column
[ module size 6 ][ module size 6 ] => 2 full columns
[ module size 6 ][ module size 6 ] => 2 full columns
[module size 4][module size 4][module size 4] => 3 full columns

Expected result

[ module size 12 ] => 1 full column
[ module size 6 ][ module size 6 ] => 2 full columns
[ module size 6 ][ module size 6 ] => 2 full columns
[module size 4][module size 4][module size 4] => 3 full columns

Actual result

[ modal size 12 ][ module size 12 ] => 2 full columns
[module size 6] [empty space] [module size 6] [empty space] => 2 columns (with empty spaces)
[module size 6] [empty space] [module size 6] [empty space] => 2 columns (with empty spaces)
[md4] [empty space][empty space] [md4] [empty space][empty space] => 2 columns (with empty spaces)
[md4] [empty space][empty space] => 2 columns (with empty spaces)

System information (as much as possible)

joomla 4.4.4

Additional comments

in joomla 3, I have these positions of modules (in admin cpanel) :

[ module size 12 ]
[ module size 6 ][ module size 6 ]
[ module size 6 ][ module size 6 ]
[module size 4][module size 4][module size 4]

but in joomla 4.4.4, I have these positions of modules (with empty spaces) :-(

[ modal size 12 ][ module size 12 ]
[module size 6] [empty space] [module size 6] [empty space]
[module size 6] [empty space] [module size 6] [empty space]
[md4] [empty space] [empty space] [md4] [empty space] [empty space]
[md4] [empty space] [empty space]

Thank you in advance for your assistance