Family visit visa validity - only 1 month( before it was 3 months )

hi, gud evening.. 
i applied family visit visa for my brother, they issued but validity is only for 1 month. . i heard that it was for 3 months before.. any new rule or by mistaken issued for 1 month.. can i extend it further.
  thanx in advance.

It could be a mistake most likely ... as visit visa's validity is for 3 months and extendable by 1 more month.

hi! May I know how did u apply your visit visa? through ur company or by agency?? how many days processing??