Sorry that this happened, the jump from version 2.2.2 - 3.9.2 must have come with changes. Im really sorry i didn't foresee this ( i assumed the Gridder would remain the same) . Did you have any backup's or the plugin "updraft"? if not you will have to re-order the layout, i'm very sorry.
Apologies for not seeing this Nike 😔
Sincerely
Richard