24 Hour Clock Using J/K Multisim Help

I have just designed a 24 hour clock using multisim using J/K flip flops and the 7 segment displays show strange numbers. Can anyone please help me fix anything I've done wrong? I'm not very good at multisim.

How "strange" are the numbers?

There are 0s, c's , 7s, and incomplete 4s.

Then is sounds like there's a problem in the connections between the 7447 and the display. Does the logic polarity of the 7447 correspond to that of the display? In other words are both the 7447 have the same logic polarity (active high versus active low).