Surface Laptop? or
Surface Book? or
Surface Pro with Type Keyboard?
Surface Pro with other keyboard?
I ask because
1. Didn't think you could detach keyboard from surface Laptop.
2. If you have Book then there are a lot of documented issues with keyboards not docking well and misbehaving.
3. I've been using construct 3 on Pros with the type keyboards with no issues.
4. If u are using other keyboard there could be blutooth issues. Also if using usb keyboard a usb cable touching the screen will set off touches.