Why this sheet metal model can't be unbend?

[zhenqiang]

Hello,I designed a sheet metal part,but a flat wall feature can't be unbend,picture follows,I want to know the reason.Help me please,everyone.

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[Jeroen · Accepted solution]

For some reason, the accuracy of your model is set too low.

If you go to

File --> Prepare --> Model Properties --> change Accuracy --> set to absolute and to a low value (I've set it to 0.02)

Now everything works like a charm.