Electronic – How to unhide hidden pins in proteus

I added the same object in eagle now too and it works fine here.

Maybe the 'random' pins are also connected ground for example. If the shift register is closer to a component that is also connected to ground you will see a yellow line (from the unrouted layer) to that component.

To check if this is the case you can use the show function on the board layout screen. (you can use this function by typing show in the text bar) Then click on the yellow unrouted line. everything that is sharing the same net name (GND in our example, will light up. You can now easily check if the arduino ground pins are lighting up. Also the name of the net is showed in the bottom left corner of the screen once you used the show function.

Like Scott Seidman already said in his comment you can use a switching regulator. But i would suggest to replace the 7805 with the regulator. You could use for example the LM2575. This one comes in your preffered TO220 package, too.

Another sideeffect is that your circuit wouldn't consume as much power as it does right now, because the power won't go into heat anymore.

Edit: Altered my answer according to FiddlyOhm's comment. I researched too less, sorry for that. My intention was to say that you don't neet a fixed voltage regulator anymore if you have an switching regulator like the PT5101. I hope it is more clear now.