VBA Tabe Shifting

Dear all

i have vba userform on excel
it has about 20 textbox

usually i have to navigate between them using enter key or tab key

BUT
it jumps from box 3 to box 6
and from box 11 to 8
and from box 9 to 17

there are maney like this

please
I need to know how to organize this sequence with the way I need ???

thanlks

thanks so much