Thanks for reporting this issue!! I was able to reproduce it both oh Windows and Linux platforms obtaining weird format such as the one below:
I was unable to find out any clue about the reason of this error taken a look go the Apache logs. I've been investigating and it doesn't look something related with the Bitnami stack. It seems to be an issue about Prestashop itself.
Could you please contact PrestasShop developers? They might provide you more information about the reason behind this weird behaviour.