When creating a segment - you set Start and End points shown on the map.
But usually as a result created path is shortened by one fragment.
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Creating a segment:
.
Result - saved segment:
.
Stats for the segment are exactly the same, but the last fragment at the end is cut (missing the last turn to right).
If you want to get your full path - you need to add 1 more fragment at the end.
But this won't correct the stats.
.
What's more - short time ago they disabled re-edit option. When saved segment is wrong, you need to delete it and create again. This could be accepted for old segments, but it's really annoying when you want to slightly re-edit a segment you just saved a moment ago.
And also they disabled auto scan for newly created segments. So old activities won't auto add new segments. They replaced auto with the manual re-scan option, but this doesn't always works. Sometimes an activity has some segments, but then those segments just disappear from that activity and re-scan won't adds it back. Before, with auto scan, this never happened.
So, almost everything about segments is buggy.