First, the SSR has a "zero cross" feature. This implies that the source on the load side must be AC. DC won't work since 0V will never be crossed.
Second, if this happens only with inductive loads then be aware that it doesn't look like the PCB maker followed Omron's advice (
datasheet pg 386) regarding inductive loads.
The datasheet says "No overvoltage absorption element is built in. Therefore, if the G3MB is connected to an inductive load, be sure to connect the overvoltage absorption element."
I see a fuse on the load side but that's not the same thing.
The PCB maker very likely expects the user to do this since it is very load-specific and would likely interfere with non-inductive loads.
If the SSR will shut off for resistive loads but not for inductive loads then you might follow Omron's advise in the
SSR Design Considerations booklet, pg 831.
They advise the use of varistors, zeners, RC snubbers, etc., depending on the various factors.