Border Issue in PSP9

I've been wondering about this for a while, though I never really minded, until now, because it's really beginning to get on my nerves.

I use PSP9, and for some of my icons, I like to add a thick border. Simple enough. But, I'm curious. When going up to Image > Canvas Resize, if I want a 10px border, I have to resize the canvas to 80x80, because, for some reason, the border seems to double in value even if it can't be seen. Am I making any sense at all? Another example would be, if I wanted a 2px border, one would think that I'd just resize the canvas to 98x98 and go from there, but, no. I have to double what my border's width is going to be, so 96x96.

It's really starting to bug me, since it was working perfectly fine when I first installed PSP9 God knows how long ago. Any way I could get it back to normal? :/ Or maybe it's supposed to do this?

Thanks in advance! ♥

EDIT: Questions answered, thank you! :)