a) when you toggle the switch tile in the mobile app, everything runs as you expect, and the LED light on the physical light switch does go on and off
b) when you toggle the switch physically on the wall, the apps don’t run, but the LED light on the switch does go on and off.
Could be a routing table issue.
Are these switches by any chance farther away than the earlier ones that did work?
Did you pair them to the network in place, or did you pair them physically next to the hub and then move them to their current position for wiring? (This is sometimes called a “bench install.”)
If either of those two things are true, I would start with a Z wave repair to see if the switches can be set correctly in the routing tables.