Hi Chirath,
maybe the other Preset Voice you used happened to have the parameter value you mentioned.
Usually when you call up another Preset Voice directly (via the Voice Selection display), all Voice parameters are always reset to the preset settings. The only exception is if you have disabled the automatic use of the Voice Set (in [FUNCTION] > MENU 1 > VOICE SET FILTER). In this case, all Voice Set (Voice Edit) settings of the previously used Voice are retained when a new Voice is loaded.
Best regards,
Chris