This is from the spot instructions
BASIC TRACKING: With Basic Tracking, messages are sent every 10 minutes for 24 hours while moving, or until cancelled. To re-engage Tracking after 24 hours has passed, press and hold the Track button until the function light blinks green.
NEW ONLY WITH GEN3
UNLIMITED AND EXTREME TRACKING: SPOT Gen3's new enhanced tracking options allow you to "set it and forget it." Send track messages every 2 ½, 5, 10, 30 or 60 minutes (depending on your plan and preference) for as long as your SPOT is powered on or until the batteries run out.
To set your rate of tracking, sign in to your SPOT account at FindMeSPOT.com and choose 'view/edit' SPOT Features from the My SPOT Devices tab. PLEASE NOTE: making any change to the rate of tracking requires you to reconfigure your device to update the settings.
So it would seem the change of tracking rate is the issue. I cant seem to find out how to change it on the website. I think Duncan Lovett would be the man to ask as he set up the Braunton tracking page and seems to know the units inside out. Sorry I cant be of more help