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Tested the sequence 1) Get new satellite fix 2) Clear Track AND Trip data (2 is a single combined option on 62stc).
The result is what I wanted to see. - no line back to previous end of track on map and the trip odometer value is now only the new distance.

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Since my post saying I would try  'clear track and trip data' I have found a post by Garmin entitled: Why am I experiencing a difference in distance between the Trip Computer and Track Log? Which advises ◦' When you have arrived at the place you will be recording:
1.Acquire a GPS satellite lock
2.Clear Track Log
3.Clear Trip Computer
Note they  say clear both Track and Trip
I think also that item 1. has been part of my problem because my unit has been slow to find the new location and I suspect it still has my previous location and is using it as the previous point in the current track - even if I use reset (only) trip data.
I will try this and report another day.

I have the same problem of distance from home being added on my GPSmap 62stc. There is a straight line on the map screen even after reset of trip data. The last current track segment in track manager does have the correct distance since reset but the Trip Odometer adds the home distance (crowflies). Thanks for the info re auto joining of two track segments across a power down. I have been grateful that the machine copes with an emergency battery change in mid march but had not worked out that it would apply to all power off/on cycles. That insight helps a lot.  I am going to try reset 'Track and trip data' next time - maybe that is what is needed. I Will report the result unless someone already knows what will happen?