Previously I was able to get a personal record for a shorter distance than I actually ran. For example when I ran my first half marathon I received a PB for 10k and half marathon. Today I ran my fastest 10k yet on a 9 mile run but for some reason Garmin has not awarded me with this. Can anyone help, have I changed something in the settings?? I have looked and cant see anything that I could have changed. Not sure if you need to know this but I have a Garmin Forerunner 15. Thank you in advance