<font face="Arial, Verdana">It is not a display issue. It is the encoder sending switch signals. I assume your display has a slower encode as the set</font>
<font face="Arial, Verdana">#define UI_ENCODER_SPEED 1</font>
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<font face="Arial, Verdana">so try 2 or 0 (not sure which value is slower) and it should work.</font>