The reason we recommend that distance is to reduce the amount of current supplied to your controller. If you are worried, I would make sure there is 15 of wire in between the two, but actual distance isn't quite as important.
However, after looking into your device, it looks like your zone current values are actually very low (we would expect high if it was a relay issue.) I'm thinking something may be going on with your common wires... Can you ensure that they are all securely installed in the terminals? You can give them a tug to check! If they all seem fine, it would be very helpful to get a picture of your current wiring set up and your previous wiring set up, if you have those available to you.
Let me know!