GoldenDict
You’re having trouble with GoldenDict? We might have the solution right there.
Tibetan vowels all mixed up
Uncheck Ignore diacritics when searching
in Settings > Advanced
Complex characters all messed up
If that happens to you, open the Settings and under the frame “Appearance” change “Interface font” to be a font that supports complex characters fully. Personally I use “DDC Uchen” not only as “Interface font” but for all “Safety fonts” as well.