Heat pump and oil running at same time

I have Raheem hp with rheem oil furnace for emergency heat. The hp and furnace are running at same time. Hp comes on 4 minuets later oil comes on. Both are running at this time Stay says heat and aux heat When stat is satisfied oil off first then hp When unit is below 30 : fan comes on for 4 minutes then oil fires with no hp Above 45 on ho runs
So any idea what is causing both hp and oil to run at same time?
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