My Garmin s62 keeps changing my H/C to a much lower one and therefore my stapleford points are really low??

I set my handicap to 27 for most local courses, however, the Garmin comes in with a small SF score, then I have to manually change the H/C in the scorecard settings, which doesnt always reflect in the points... very frustrating.

Also, as a round goes on, the S62 doesnt seem to recognise shots and so I have to manually add them later....