Those traces look OK to me. It took me a while (with my video editing software) to extract the traces for A5/6 and A4/8 - but I got there in the end.
There is something not quite right with the triggering though. The two traces for A5/6 and A4/8 should have exactly the same waveform for channel #2 (BA15) - but they don't. This implies to me that the oscilloscope is not 100% configured correctly and it may be triggering on channel #1 rather than channel #2 (or something like that).
Can you post a photograph looking directly in front of the oscilloscope to see where all of the controls are set to please.
Also, can you double-check the setting of the ALT/CHOP button please. It should be pushed IN (CHOP mode).
If I can get this tonight and see if we can sort out why the configuration is not correct we can make some more progress tomorrow. I will need to think of the next step. The oscilloscope configuration will not change the results though...
Incidentally, the double line for A3/8 is nothing to worry about. The signal is well and truly HIGH. It is just picking up some slight deviations in the voltage level each time the trace sweeps across the screen. There will be some (minor) crosstalk between signals. This is a 'real' circuit as opposed to a theoretical circuit on paper - so you will come across imperfections like this.
The 'trick' or 'knowledge' is to know when something is OK and when it isn't. This is experience - and you need to build up your level of competence with the oscilloscope as a measurement tool.
You are starting to improve in that area - so the more measurements you take the better.
However, you need to also start to develop your own relationship between what the circuit should be doing, how we configure the oscilloscope to take the measurements to ascertain whether it is working or not, and then how to interpret the results. Remember, the oscilloscope is a tool - no more no less...
Dave