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invert the bits , then connect the common cathodes pins to ground , the shift registers can't deliver that power for 7 SEGMENTS use 7 transistor in between the data pins of leds (a,b,c,d,e,f,g,dot) and shift registers better to use ULN2803 , and invert the 4 controlled transistor (base pins as it is, connect the emmiter pins to ground and collector pins to common cathode )
it is possible to directly connect display to raspberry , in my version we can also possible to connect the Arduino with computer with same code
Multiplexing four 7-segment displays using Shift Registers Arduino
Real time clock using DS3231 (EASY)
Multiplexing four 7-segment displays using Shift Registers Arduino View Instructable »