Amai PreOrder Manager + Notify

The pre order manager affect other products even if you have them disabled and I have tried working with there staff to resolve the issue. I have to be like a parrot with them because I keep tell them that the product that is being affected isn't even suppose to be used with the pre order manager and it is disable. Same thing about inventory I told them maybe 3 times that I used third party inventory to track but they keep saying to check the box that shopify enable inventory tracking. Maybe they will read my review and actually see and read for the last time my issue. The pre order manager works great on the products I enable it on and work horribly not he products I disable it on.