said by Shinrin:
it could be because the speed updates haven't rolled out for your area yet. the site list for a default area then when you put in your address it list for the area your in.
Yep, that was my first response as well. They are showing the "old" Blast speeds, and not all areas have completed updating.
Also however, as was mentioned, sometimes Comcast offering info gets muddled up, and not surprising when they are in the midst of ramping up speeds for the performance/blast/extreme tiers. Best to call and ask to ascertain what speeds really are
currently available in your are.--
Deeds, not words