There's a marker that draws a baseline for the bottom half of characters such as p, j, q, g, etc., and it looks like it's right in the middle of the characters.
Here's Arial, Times New Roman, and your font:
A - Ascender
C - Caps height
x - Character height
D - Descender
I don't remember how to do this in FontForge, but I can tell you how to change it using TypeTool 3 (Windows): Right click the "D" line, choose "Properties" and set it from
333 to
-333. This looks like an exact match for the "g" character. Then go to File, Generate Font and select Open Type.
Even though I use Arch Linux as my main OS, I always thought that FontForge was fugleeee (emphasis on the
eeee). It's why I keep a virtual machine with TinyXP around, for situations like this.