REL sub connecting both high and low question...

I'm using my Rel Strata III for both 2ch stereo and Home Theater. Thus my Rel is hooked up with both rel supplied high level input and the .1 LEF input.

My processor is Meridian 561. I set it up so that for stereo all the signal goes to my main amp internally crossed at 38hz by Rel, and for HT crossovered at 80hz by processor.

I have no problem with stereo set up.

However, for the HT, I think I'm getting duplicate signals from both low and high side. I think I'm getting significant amount of signal from high level side which I think it doesn't make sesne...

Since my processor is not sending any signal below 80hz, and the rel is internally crosssovered at 38hz, why still produce a lot of bass from high level side?

Does my Rel supposed to still receive any signal from high level when listening HT? Isn't it supposed to cut the signal from high level when getting low level signals for HT?

Am I doing something wrong?

Anybody using REL and hooked up both high level for stereo and low level for HT?

Thanks

Andy