<unk> not populating

I am making a domain-specifc spell corrector (input = misspellings, outputs=correct spellings).

Is there any reason the unknown words placeholder (<unk>) would not populate by default? My model just guesses at everything for some reason. Happy to provide any code if that helps.

image

Hi,
This very much looks like this post : Translation: unknown words replaced with one word, instead of <unk>

Thanks! I will try that out.