You probably entered the data correctly, but K M if you played 30 mins and your heart was "going fast" for at least 2 1/2 times that length of time as a result (and not just from the excitement of watching the sport), then I would let that doctor who has you on a prescribed rapid weight loss program know about it.
The prolonged rapid heartbeat you described could be an arrhythmia. Most arrhyhtmias are harmless, but some reflect larger problems like heart disease that may require treatment and management. Since you're already under a doctor's care, no harm in raising the subject during your next check in!
BTW, congrats on your weight loss so far. Wish my chart looked as impressive as yours!