Changing duration of activity

Hi all,
I had to upload an activity from Polar Flow today after my watch died. On the activities page, it shows the activity took 28 minutes. However it actually took 45 minutes, and the shorter time is making the pace for the activity wrong and I think throwing off load calculations in my fitness graph. The weird thing is, when I open the activity it shows both the correct time and the wrong time in the upper left corner. How can I fix this?

One is moving time, one is elapsed time.

The problem is, I was moving the whole 45 minutes

Then it could be unreliable GPS signal.

Did you ‘ignore velocity’ as posted in the link?
it should fix your issue.

Ah, missed that, thanks