Problem with 74hc595 voltage in Autodesk Circuits
Those 220 ohm segment resistors are too small. Make them larger, and you can do away with the 100ohm cathode resistor. The HC595 package has a 70mA total limitation on the current in the ground and VCC pins. Although 220ohm gives you 15(ish)mA per segment, which is OK per output pin, the total number of segments is too much. You need to use a minimum of 330 ohm segment resistors, to get to less than 10mA per pin to meet the 70mA abs max limitation in the datasheet, or 470 ohms per segment to meet the 50mA limitation the simulator wants. The 50mA is a better max, as the 70mA is an absolute max spec, not a recommended current level.

Unfortunately the cathode resistor is doing more than what you want, as the changing total current through the display will alter its voltage drop, and hence the brightness of the other segments. Don't use one at all.

BTW, that's not a schematic you linked to, it's a picture. If you want higher response to your questions, learn the difference, and post a schematic next time. You can generate a schematic with the button above the edit post box (the one with the diode, capacitor, pencil and resistor).