It’s my understanding that TR is simply taking the raw file from your Garmin but through Strava and displaying that data while Strava is doing some post processing before displaying it. So Strava will attempt to use both your Garmin’s collected elevation data and know elevation data from their mapping and reconcile the two in case your garmin’s data is way off due to weather patterns, dirt stuck in the barometric sensor, etc.
Your numbers are all within +/- 5% so for me I would say they are all correct within an acceptable margin of error. You’re not using super precise measuring tools so that’s just something that you’ll have to deal with I think.