Podcast not showing all shows?

[Andrew Wheeler]

I listen to the podcast almost everyday and am going through all of them, but today, only the latest (20) show up!  I was on podcast 30 and now I can only see show 109 - 128.

Is this  a change to Itunes or something else?

Bummer if we can't access the wealth of knowledge that was there previously.

let me know how I can access this if possible.

Thanks!

Andrew