Saw a premium upgrade offer for 19.99 but after clicking it ups to 29.99?

So I just downloaded Avast free and uninstalled Mcafee, and I was going to just run with Avast Free but saw an annual upgrade subscription offer for 19.99. It’s my girlfriends Laptop and Mcafee has been running it hot for a while. I figured might as well get it at 19.99, but after clicking through to purchase, it increases to 29.99? Has anyone else seen the same issue?
Edit: And does anyone know how to get the front screen offer of 19.99?

Please provide screenshots.