I have the same bug in my 1030 with the latest (and probably last) firmware 13.75 as is described in this post:
forums.garmin.com/.../edge-1030-strava-segment-list-corruption-bug
I have issued support tickets at both Garmin and Strava and of course they blame each other 
and all you other, have you got this solved? Maybe by upgrading to a newer Garmin device?