If you've got a stop earlier in your history then there should be an even earlier start.
You can set the 'Event Filter' drop down on your travel history to just show FSD jumps, and then add a Field Filter like this:
to get only the jumps with a stop or start marker. This should make it easier to figure out what's going on.
If you're still stuck then throw up a picture of those filtered results and I'll see if I can see what's going on.
Aha ... after some digging about, I've found it !!
I had a start flag on a "Scan" entry, not an FSDJump entry.
Thanks for your help