Why do I get a weird negative space below my characters when I export my typeface?

Hi! I’m getting a weird negative space below my characters when I export them. You can see it when you select the character as it highlights it more and even the text bounding box of Adobe Illustrator shows there is a negative space below, however this does not seem to appear when I’m using Glyphs. How can I fix this?

Thank you!

Check out the tutorial on vertical metrics:

In Adobe Apps, it’s most likely a glyph that actually reaches below that far.