Rules Disparity between NS and KL/Selangor

There seemed to be a rule disparity between Negeri Sembilan(NS) and KL/Selangor.

The rule is in relation to the "USE OF A SINGLE HAND" to move the chess pieces and press the timer.
KL/Selangor consider it as an illegal move to use both hands (e.g. LEFT hand press timer whilst RIGHT hand move the chess pieces & vice-versa) whereas NS consider it as a "Gangguan (Disturbance)".

Eldest found out this disparity which was to her detriment in the ongoing MSSNS State Finals held in SMKA Pedas in Rembau, NS.

To explain, I need to Go back in time to JANUARY 2013.
In the INSOFAR competition held in January at Shah Alam, Fathina was deemed to have made an illegal move when her opponent claimed that she'd use both hands.

Having learnt from her mistake, in one of her Round Match - her opponent had made 2 illegal moves before. When her opponent made the mistake of using both hands, she took the opportunity to claim for her 3rd illegal move & raised her hand to complain.
However, the arbiter (or rather more than 1 arbiter) ruled that it was a "Gangguan" and ask them to continue playing.

She was so upset that the arbiter ruled against her when in the Insofar event it was the other way around, that she lost the game after that.