Somehow I ended up with two Gravatar Profiles and the old one kept displaying every time a visitor clicked my Gravatar.
It is quite easy to delete a Gravatar Profile.
Visit your account by logging into WordPress.com with your username and go to https://wordpress.com/me/account. Once the page opens scroll down the page to “Close your account permanently” option at the bottom of the page.
An “avatar” is an image that represents you online—a little picture that appears next to your name when you interact with websites.
A Gravatar is a Globally Recognized Avatar. You upload it and create your profile just once, and then when you participate in any Gravatar-enabled site, your Gravatar image will automatically follow you there.
Gravatar is a free service for site owners, developers, and users. It is automatically included in every WordPress.com account.