Hi,
Thank you very much for the details, it helps a lot!
It seems like there might be some sort of an unknown bug – when both filters are selected, it works. For now I have set relative values to both filters to make it work, but I would like to debug this issue more. I suspect it has to do something with the empty value on the second filter, somehow overriding the first due to the same field name.
I tried to log-in via (s)FTP, but it does not authenticate, can you please check that?