For Solder Paste Top - non mirrored view, Solder Paste Bottom - mirrored view.
It's good to indicate on gerber file what kind of "view" you are sending.
Just say in your description of the Gerbers that they are not mirrored. Using ODB++ is another option.
We send both stencil gerbers non-mirrored. On the stencil gerbers we add "SQUEEGEE VIEW", right reading on the front and mirrored for the back side gerber.
This is the first time that I understand the mirrored and non mirrored option while taking gerber ,In noraml case there is an option to change the mirrored and non mirrored ,But if the tool having only the fixed option there is a change of wrong stencil creation and if we addd the text image like "squeege side " or "process side" this will be very benificial to eliminate the errors.
Thanks and Regards