@sthinda - let’s try to simplify things first. It looks like there were four common wires on two terminals on the original controller (I can’t tell 100% if there is an arrow for valve common on the fifth terminal - what is the make and model of the older controller)?
I’d wire nut the four white common wires (one thick, three thin) together along with a pig tail to go into the Rachio’s C port directly. In other words I want to take the isolaters out of the loop for debugging.
Then see if all the zones that are connected work. Then we can work on integrating in the isolators and the second Rachio.