Your Festo valve is mounted incorrectly and will leak if you don't fix it.
Festos are not designed to be used with Tygon; the Tygon is too soft and not exactly the correct size. Change that to a polyurethane tube.
Also having a tight bend right at the valve puts a side load on the o-rings inside the Festo and will cause a leak. The tubing should have about an inch straight section just before and after the valve.