Is 'pen' or 'pen' correct?

Some people insist that the word "chập bản" is the correct spelling. Others say "chập bản" is correct.

In your opinion, is pen or penned correct?

“Chập bản” and “chập bản” are two words that are easily confused because their pronunciation is quite similar. So in your opinion, is “chập bản” or “chập bản” the correct spelling?

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Source: https://vtc.vn/chap-but-hay-chap-but-moi-dung-chinh-ta-ar786543.html