knob alias graphic issue...

[SysEx]

Hi,
I've tried search in the forum but I didn't find anything relating this...when I create an alias for a knob its values are not refreshed when changed (new values are drew over the older ones). The picture should make the problem clear.
I've done some tests and this seems to happen only with knobs aliases (and not, for example, with fader aliases).
Has this happened to anyone?