Please be sure to turn the phone's screen off (press the power button) before you put the phone in your pocket. It will switch to black 'SmartLock' screen mode and reduce brightness to the lowest level. In this mode you can still scan the tags, but accidental inputs are blocked and screen does not use much power.
Here's what this mode looks like:
To resume the app, please swipe up from the bottom middle of the screen:
NOTE: If this doesn't solve the issue, please report the problem about the round where you see incorrect/random entries.
To do this, while the round is active, tap the menu button in the upper left corner, select 'Report a Problem', select 'Golf Pad did not work correctly during this round', include a brief comment explaining what went wrong and send the report.