Flow-Variables not working with Parameter Optimization Loop Start?

Dear community,

is there a bug within the nodes Parameter Optimization Loop Start/SARIMA-Learner or did i made the wrong configurations?

For test-purposes, i did create 4 flow-variables for SARIMA-Learner:

Even though i created 4 parameters, I only used 2 of them for SARIMA-node:

Nevertheless, KNIME uses all 4 parameters in the loop:

Is this how it is supposed to be, did I get something wrong?

Workflow and dataset are in this post:

Best

Jakob