This field responds to your reported activities. If the number is not correct simply:
visit your Activity App profile and enter the "EDIT MY PROFILE" tab
scroll down and click "SAVE" at the bottom of your profile
confirm that the page saves (additional fields may need adjusting)
After re-saving your profile, your "# of Trainings This Year" field should refresh correctly.
This field responds to your reported activities, and cannot be edited directly. Continue to submit activities with specific "Areas of Focus" and the corresponding "Area of Expertise" will reflect that work.