Touch Screen Triggered by Water Surface

I noticed last night in the bath that the surface of the water was being detected by my MARQ Athlete as a touch, making it scroll through and select Glances. This was easy to replicate by dipping the lower edge of the screen below the surface - it was the motion of the surface that seemed to trigger it. Probably not an issue as I imagine most people have Touch set to 'off' during activities, but thought it was worth mentioning as I never saw this behaviour on my Sapphire Epix 2.