Load swapping and unrelated results

[LucasMSpereira]

While trying to come up with a way of generating random FEA problems and running topological optimization on them, I ran into a strange issue. Sometimes, judging by the von Mises field, the 2 loads applied seem to have swapped their positions (see figure below). And less frequently the von Mises field doesn't seem to be related to the initial FEA problem at all.

issue.zip

The attached zip contains the sufficient files to reproduce the problem.

[mohdibntarek]

Thanks for sharing this.