In MIGO, i choose Goods Issue --> Order --> order number --> mvmt type 262
the movement type on top right is just a default for the items. and it depends on the timing when it is set. a change here will not affect items that are already visible in MIGO.
better you do Goods Issue --> Order --> mvmt type 262 > Enter
followed by entering the order number, then you should have the 262 for all your items.
Otherwise.... you can always change the movement type at item level.