Don't forget that the CNG kit of Liana is somehow different then what you have in Rolla... Its injection system and is rather new technology. I guess Paksuzuki could not do proper engineering keeping in mind the sensitivity of the kit.. on the other hand you can surely expect this from Paksuzuki...
the strange thing is that a new thing is introduced by PakSuzuki, so it would definitely have problems before they get rid of all the bugs, in this case "all the bugs" are in the CNG kit. 