This is the old Voice, so you must have clicked a wrong link somewhere. I don’t know what exactly you did to get there, and obviously you don’t know it yourself so well.
To get to the new site, you can
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click a speaker icon on a SuttaCentral suttaplex card or sutta page
→ in this case you should see a dialog like this:
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or else just go directly to
sc-voice.net, open a search card, and typean5.57in the search field.
You may also be interested in this new feature that has been added just yesterday in order to listen to longer playlists.