How did you export?
The OTF you sent me has hints. Make sure you have no Hinting in the font. (Read the Complex Paths tutorial to find out why.) The Autohint option must be off in File > Export.
Consider the Custom Parameter Autohinting in Font Info > Instances and set it to off. The parameter overrides the export dialog setting.
Your winDescent does not encompass the descenders of g and y, which is why they can be cut off under certain circumstances. The winDescent value in your file was approximately 280, but g and y in your font go way below -300.
You can visualize your vertical metrics with Window > Plugin Manager > ShowVerticalMetrics.
Yes. The problem is that the values are not chosen in a manner that they fit all letters in your font. The j is also cut off a little, by the way. Your winDescent value is approx 280, but j, g and y reach below -300. If you want to avoid cropping in those letters, you need a winDescent value that is at least as big as the descenders of the letters.
So you can either:
- redraw the letters to not go as far as your winDescent values. In your case the lowest node of j, g and y should not go below -280.
- Or you measure the lowest point of your letters, and set your winDescent value to at least that number. In the case of j, g and y, you can see the y is the lowest-reaching letter, and the lowest point in the y is at approximately -390. So you would set you winDescent value to -390.