Hi lnino,
Thanks for making us aware of your experience. I was just able to reproduce the behavior you described and there does appear to be an issue with our CSV Reports tool that is causing sales from active fixed price listings not to show up in transaction reports which we will need to address with a future update of our site.
I am uncertain when we may be able to release a solution for this particular issue at the moment, but I will let you know when the issue has been addressed or any other pertinent information becomes available.
We apologize for the inconvenience. If you need any further assistance with your account in the mean time, please feel free to contact our Customer Support team by mousing over the “Help” tab within your account and selecting the “File Support Case” option.
-Mike