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why

I just want both sides to lift up like the one on the left so that I can make a cool paper airplane folding animation. I tried with a plane and got the same issue. I even tried using two loop cuts in the middle and putting them right next to each other.

Update: enter image description here It may be hard to see but the little dots that indicate the middle of a face are in a bunch of weird spots.

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  • $\begingroup$ As well as @Sazerac's answer below, since paper planes are always symmetrical, you could model under a Mirror modifier. Delete the right half, then work on the left, and have the modifier do the right. $\endgroup$
    – Robin Betts ♦
    Jul 29, 2019 at 7:24

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You have overlapping faces in your model. You need to delete the ones you don't want.

If you use the dots in face select mode as a guide, it should be hard to find and delete them.

It looks like you may also have duplicated vertices, so I would suggest also using the remove doubles tool on your model to get rid of them.

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  • $\begingroup$ This problem has been happening even with a blank plane though, even before I section it apart. $\endgroup$
    – Rami Souguir
    Jul 29, 2019 at 8:42
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in Edit Mode select all, and press W and select Remove Dobles now pres CTRL + N to correct normals

if you have one or more faces with inverted normals, select only the faces that have the problem, press W and select NORMAL FLIP

enter image description here enter image description here

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