I've purchased Bamboo Paper app for my Surface pro and it's amazing but I've got a small issue with it. Also bought Writer add-on and there's a vertical and horizontal notebook and that's what I've got my problem with. When I choose horizontal lines notebook it shows ok when tablet is in horizontal position:

but when I switch tablet to vertical position, lines become vertical:

Not sure how to explain this issue in other way. Hope images show it all.
It's an amazing piece of software and that one notebook style is the one I need the most.
Please help...