They don't look like they have the same number of spans. I can't post an image, but your patch layout is roughly
ABC
DDE
FGG
where each letter corresponds to a separate surface. So you cannot attach A to D for example, as they have different numbers of CVs in that direction. What should work is to go horizontally, ie attach A to B to C, attach D to E, and attach F to G. Then attach the three rows. Hope that makes sense.