Welcome to the Hubitat Community!
I don't think you can do anything about that. I've never had that issue with either of my two Aqara motion sensors, or the three Mijia motion sensors I have. You may simply have a defective sensor.
However, if there is sunlight hitting it, that can cause any motion sensor to give false triggers. There is an option in the HE Motion Lighting App to turn on only if Lux is below a set value. You could try that if you have a sensor that is giving false motion events when sunlight hits it. Or better yet, move it so that doesn't happen. 
Best way to use any Xiaomi device in my opinion is to connect them directly to either an Aqara HomeKit hub and then use Homebridge and HomeKit automations to sync their responses to virtual switches, or get the specific version of the Mijia Gateway and used the MiConnector app. I use the former method, and this works perfectly. Xiaomi devices are not standard Zigbee and thus can be hit and miss on anything but a Xiaomi hub. But connect them to a Xiaomi hub and they are incredibly stable and responsive.
