Android ChatGPT app spontaneously switched UI language from English to Bosnian

Summary

The ChatGPT Android app unexpectedly changed its UI language from English to Bosnian without any user action. Android's system language remained English.

This occurred around the same time as a prior Voice conversation becoming stuck/crashed in a persistent spinning state, so the two may be related app-state issues, though that is not confirmed.

Environment

• App: ChatGPT Android
• ChatGPT app version: 1.2026.251
• Android build: 2625105
• Device: Pixel 10 Pro
• OS: Android 17
• Subscription: Plus
• Date observed: 2026-09-12
• Android system language: English

Actual behavior

The ChatGPT app UI changed to Bosnian on its own. Examples visible in the settings UI included:

• Moj ChatGPT
• Personalizacija
• Memorija
• Dodaci
• Račun
• Opća podešavanja
• Glas
• Odjavi se

The message composer also showed Odgovori.

The Android OS language itself was still English, so this was isolated to ChatGPT's own app-language setting.

Separately, a Voice chat from immediately before this remained hung with a spinner/crashed state rather than terminating cleanly.

Expected behavior

The ChatGPT UI language should remain English unless the user explicitly changes the app language. A Voice-session failure should not mutate unrelated application preferences such as locale.

Recovery

Navigating to ChatGPT settings and manually selecting English under the app's language setting restored the UI language.

Reproduction

Not yet deterministic. Observed sequence:

1. Use ChatGPT Android normally in English.
2. Have a Voice conversation.
3. Voice session becomes stuck/crashed and remains spinning.
4. Open ChatGPT settings / continue using the app.
5. UI is unexpectedly rendered in Bosnian despite Android remaining configured for English.

No language-setting change was intentionally made by the user.

Screenshots were captured showing the Bosnian settings UI.

Start by reproducing the reported sequence: use the Android app in English, have a Voice conversation become stuck, then inspect the app language and settings. Compare the app language with the Android system language and determine whether the Voice failure precedes the unexpected Bosnian UI. Done means the UI remains English unless the user changes the language explicitly.