Valve won't cycle in Spa Mode, will cycle in Pool Mode

I have a a pretty standard pool-spa valve set-up with with two Pentair 3-way valves. Pump suction side is either 100% pool or 100% Spa. It has a 12-yr old Pentair actuator that still works correctly in both pool and spa mode. The return side is approx. 75%pool/25%spa in pool mode and 100% spa in Spa Mode. It is driven by a 6-7 yr old Intermatic PE24VA Actuator. My control panel is a 12-yr old Pentair Intellitouch, with a wired indoor control panel.

If system is switched from pool mode...

Valve won't cycle in Spa Mode, will cycle in Pool Mode