Prevent cloud redraws causing unwanted clouds

Always using the Beta 431 with DWC, I found that if this box is thicked then I get the wrong cloud depiction. The arrival METAR gave a ceiling at 11000, interpolated. Close to this station, another one had a TS reported. Well, I had clouds down to the ground at destination. I simply unchecked the Prevent cloud redraws, it refreshed the wx (same METAR) and the clouds went away. This appears to be the same problem as other users are reporting to have clouds when it should be CAVOK, not at the beginning, but while flying they start appearing. It seems that this option messes things up with clouds' depiction. By they way, CAVOK and NO DATA always at 0.Cheers,FedeEDIT: I forgot, no additional stations or enhance route coverage selected