ak47 questions

im growing some original ak47 i veged them for 3 weeks until they was about 40 cm they have been on 12/12 for nearly 5 weeks now and they still havnt started flowering, i no they are a sativa strain but is this normal, everything in the grow room is perfect, i also have some g13 blueberry and jack flash which was turned to flower the same day and they are doing really well and have big buds all over them, the ak47 are 100% healthy they look great but just arnt doing anything, has anyone grown these and could give me some info, thanks guys:joint:
 
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