Issue creating accurate liner for use as concrete facing

I tried to create a liner to use as concrete facing for my MSE wall. The outcome appears skewed and I do not know how to fix it. See the snippet for details.

please help.

Dear Itascans, please I would appreciate your comments.

Please, can anyone help?

Or based on your experience using FLAC 3D, what is best used as a concrete facing for MSE Wall?