Default Setting for My Exercise

I walk for exercise almost daily anywhere between 3-8 miles as I am training for a half marathon. My problem is that whenever I post my run, it automatically default to brisk walking, walking the dog. Where did that come from? I don't even have a dog. I see that is one of the options, but I don't know why it is now my default, and I don't know how to change it.

Has anyone else had this type of problem? How did you fix it? Thanks!

Sandy