I can’t reproduce your flicker issue but in the past I’ve sometimes seen an issue where Paper UI keeps sending commands. Does the flickering stop when you close all browsers connected to openHAB? What browser do you use and did you try other browsers as well? Chrome is probably the best tested browser.
There is no openHAB 2 v4.1.3. The v4.1.3 is probably the Karaf version used by openHAB.
Can you also test this with the new openHAB 2.3 release candidate?