Cheers guys. I am uploading my my iMac, as prefer using the Elevation data from my Garmin 510 than what Strava suggests. I can do this direct through my iPhone, but the Elevation data gets corrected that way.
Nice to know that it's not just me. Fingers crossed that it's sorted soon, as maiden voyage on n+1 completed and want to check 2 segments that I went all out on as a trial. lol.