A font with zero space has a problem

Hello, it’s me again.

I create a font, which should have no spave before and after a glyphe.
I can set the spave with RESET to 0 and than save the font. good.

But after reopen it, I noticed, that some of the right numbers grow to 1. bad.

When I try to set the right number from 1 to 0, it jumps to -1. bad, too. Set the -1 to 0 works.

Please repair this problem. The font ist part of this message.

ZeroSpace.otf.zip (10.8 KB)