Hey Rafa,
this is not a theme issue :) Chrome is notoriously clumsy at handling RSS feeds (probably because Google thinks it is a declining technology, after itself discontinuing the Google Reader service) – see e.g. this Google forum post. You can, however, download any of the available Chrome extensions mentioned in the thread, e.g. this one, to allow viewing Firefox-style feeds in Chrome.
Sincerely,
Andrii / Satori Studio