Three dots glitch; two dots work

I’m encountering an issue where adding three vertically stacked dots above the glyphtheh-ar.medi.alt causes unexpected behavior/glitching. However, applying the same treatment with two vertically stacked dots functions correctly, as shown in the images below.

Does this happen in Glyphs or in another app? Could you send me the .glyphs file?

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The glyph with the three dots is called “threedotsverticalabove-ar”. It is not in the glyph data so it is not set to be a mark glyph. To fix this, either rename it to “threedotsupabove-ar.vertical” or manually set its category to “Mark” (activate the glyph, don’t select anything and then Edit > Info for Selection).