IFTTT and Light comes on for no reason

I have a Zwave (ZFM-80US/DA065) contact switch off one of my non smart motion sensors. If the motion sensor picks up, turn on my smart flood lights, garage lights and an indoor house light come on. The non smart motion sensor stays on for 5 minutes, If no motion smart relay goes off, all lights switch off as it should, with the IFTTT . Some time later just the inside house light comes on automatically. In the webcore log, I can see where this activates every time the the motion sensor is activated. No particular set time frame pattern of when it comes on and it does not switch off.