@Meko
All brands of paint can grow mould in Singapore. MG is more likely to grow mould because they have honey in the paint to absorb moisture from the air. Close the lid of your palette with paint in it and mould will grow in a week.

Best way to prevent mould is to ventilate the palette box, or place the box under sun but not exposed to light, basically to get the heat. Just remember mould like damp and dark places and just avoid having paint in those places and there will be no mould.