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When I export the font project I’m working on, the image of the characters looks jagged. What could be the reason for this? Has anyone encountered such a situation before? By the way, let me tell you this: When the font is installed on the computer, this rough does not appear in the programs that use it.
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I suspect the font has a gasp setting without specified rasterization techniques.

Usually a font has settings like this:
gasp.png
Either fix those settings or enable auto hinting on export.

Hint settings of my font are shown in the image below. How do I apply a setting to repair the font? I already choose Auto hinting option when exporting the font. The file named Cumhuriyet–5 with the same settings does not have the same problem.
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Do send the font and the font project to us and we will look into it.

There is one glyph with issues as it has a brevecomb out of bounds, see iebreve-cyrl.

You found the source of the problem. Thank you.