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Why the pressure applied is inverted?

Why the pressure applied is inverted?

Why the pressure applied is inverted?

(OP)
Hi everyone,
As you can see from the picture, the deformed shape is a black curve and the original shape is in green.

The pressure is supposed to be at the top but according to the diagram the pressure is applied from below.

Anyone can point out my mistake in the coding?

Also can anyone explain the significance of the region where I highlighted in yellow?

I attached along my input file and the original-deformation diagram.
I am still a noob in abaqus...my experience is still narrow.
Thanks for helping

rgrds
kaninchen

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