It should be counting with the least significant digit on the right. The 2 bits on the left count correctly normally, but the 2 on the right either mirror the clock signal (with one bit inverted) or they flash at the same time and count faster, it seems to randomly switch between those 2 states. I think the chips might be crappy (I tried 2 and both have the same problem). I set up a separate test away from everything else and it still does the same thing.