What tracker model are you using?
Were you wearing the tracker during the bike ride? If so, manually logging an activity for when you were wearing the tracker is not recommended usually causes confusion. Manually logging is meant for times when you were not wearing the tracker. When you manually log an activity, that overrides anything that was recorded during that time. It sounds like what your tracker actually recorded was 100 calories greater than what you logged it as.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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