Can you provide your app URL from the partner dash? I can check our logs and try to find the calls. Also, can you confirm all your API calls are specifying the api_version in the URL? If you don't specify the version, the call defaults to the lowest version which will trigger these warnings.
I just checked our logs, and it looks like your app is sending all calls without specifying an API version. You need to add the API version to the URL when you make your call.
So instead of calling
This guide has some suggested steps to help upgrade your app.