Device not recognized

Every time I login to one of my clubs through Free Toast Host I receive an email message like this:
"Someone just logged in to the Anthem Express Toastmasters (Club 642205) website using your member log in credentials.
You are receiving this email because the login occurred using an unrecognized device or IP address for you by your
club's website."
This used to happen when my windows updated, not it is after every login.
I always use the same computer, my desktop. IS there any way to stop these messages?
I believe my Internet Provider uses random IP addresses, could that be a problem?
Can this feature be turned off?
Thanks!

if you click the accept link, we register the device and IP.
You can stop the notifications in your club profile, email settings.