In Flow simulation,

When "Delta" has to be less than "criterion", The goal is 100% converged.

Delta is the different between Max. and Min. value over the convergence analysis interval range.

Generally, Goal plot delta & Goal value delta is equal value.

See the below image,

In spite of convergence(iteraiton=334), Goal plot Delta and Goal value Delta is so different.

Why?? I don't understand in this situation.