The good news is you have a working circuit, so logically, one may deduce much of your core hydraulic system IS working!
Double check you installed the plumbing correctly (in the right port sequence and maintained the original flows, everything is connected), then troubleshoot by using the working components to find the bad component.
As mentioned by Mr. OldnSlo, you can prove your valves by swapping the circuits to the alternate valves. Determine what the results tell you based on the new symptoms. Return them back to normal, then you're down to component swapping.
You should identify which circuit and components are working normal and mark as "known good" connectors, lines and valves, then similarly identify each of the potentially bad connectors and lines.
Draw out a diagram on paper if needed...
Once tagged, evaluate how you might use individual good components to step-by-step, one at a time - swap and test individual fittings for the function which is not working.
First place I would personally start is swapping individual Quick Connect fittings, one at a time from the good circuit to the bad and test, then go to the next, etc,. They are high probability.
The objective is to use good lines and good connectors one by one to methodically isolate down and find the bad component.