Whitch presets exactly (the names)?
In general Click termination artifacts happens when a note is terminated in a 'high amplitude' state. To avoid this you can alter how the note terminates.
In the bitInvader collection there is a preset named subbass.xpf. That has a nasty little artifact on note termination.
Open ENV/LFO
set VOLUME envelope-AMT to max
Alter release (REL) to 0.1
(-I btw think that it has this value as a factory-standard?)
Now play a note. The click is gone.
A release > 0 will terminate the note on (progresive) lower amplitude. The higher value of REL the longer 'sing' to the instrument.
Try REL at 0.8 -you now have a 'string' like sound.
Similar, clicks in the start of a note can be fixed by adding a tiny amount of attack (ATT). In this case the note begin at progresive lover amplitude.
Play with the envelopes -you can get completely new sounds this way
Best Regards
musikBear