Spa Draining After Equipment Goes Off

Hello... I was curious if anyone can tell me why my in-ground spa drains about 50% just under the therapy jets after I turn off the pool equipment?

I assume it's a faulty check valve, but curious if there are steps I should take to eliminate possibilities?

Thanks in advance!
 
Is the spa water level where it stops dropping still above the pool water level?

If so sounds like it is draining back into the pool through the spa jet line ... so likely a leaking check valve (or 3-way valve depending on your plumbing).
 
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