Try powering the FasTrack switches on track power. Put the jumper back, disconnect the separate source power wires and put them back in place.
I had some issues and while searching for a solution and finding other problems, it seems that unless you are running conventionally and need live switches in "dead" track situations, powering them from track power is the simplest and most reliable configuration.
They are designed to primarily run that way, use very little power, so won't really impact conventional operation.
I can't explain or speculate on an electrical reason, only that my research and experience with the recommendations of many reveals that they operate the best and cause the least amount of problems powered by track power.