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jakemcree
Think the Garmin calculation just calculates on max efforts over various time periods greater than (i think) 3 or 5 minutes. So if your power over one of these periods <20 mins resulted in a calculation of a higher FTP it would tell you that.
If you get on intervals.icu this does the same, and you can increase the minimum time period (think default is 3 min). Might give you a bit more information on the discrepancy
edit: took a look at the garmin file and yeah doesn't look like that has happened. no idea where Garmin has got that from