Suddenly return result in Spanish
Engineering has noted these reports and are definitely investigating.
In the meantime, try these two things:
1. Check the Language setting that Summit suggested above.
2. Add in your 'instructions' area (on the overview tab), or in the Generative Answers node custom instructions, to respond only in English.
Please note that I have observed the AI will respond in the language it is spoken to in, which is expected with most LLM models, so if it perceives a language change it might still switch to that. For example, if I ask a question in French, it may respond in French. Even if I disable using it's own knowledge.