My guess is that something in the tablet's firmware is missing initial touch events. (pcmag.com)
For example, you could disable touch events completely, disable touch in certain areas of the app, disable hardware buttons, or set a time limit. (howtogeek.com)
3M PCT multi-touch technology can register up to 60 simultaneous touch events with less than 12 - millisecond response time, making it one of the fastest, most accurate and robust solutions available to users. (politics.co.uk)