Spanish language pronunciation

I am using the 11labs API to get my assistant to speak in Spanish, but it makes a lot of pronunciation errors. It's almost like some parts are read as if it was English (such as the ll, h, g, qu sounds). But when I checked out 11labs online, the pronunciation had none of these errors.

Why is that? How might I fix this, besides manually telling the assistant how to pronounce every relevant Spanish sound?
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