A Simple Question about Foldseek

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Hello Doctor, I started using Foldseek for searching in December 2022, but recently when I looked back and searched for the same content again, I found that the results had changed. The most obvious difference is that the hit result has decreased. I am not very clear about your software algorithm. I would like to ask if this is normal. Is it because algorithm optimization has eliminated some unreliable results? If you can reply, thank you very much