Want to create cert but unable to fill info, Why?

with RouterOS7.7 and Winbox 3.37, I went to “system->certificate->”+“” to create a certificate many times dialog appear as screen show below, It’s gray almost every line except name and trusted checkbox
winbox64_whIo87fEtE.png
then I downgrade to RotuerOS7.6 and it just fine as screenshot below (RouterOS7.6 + Winbox 3.37), Is it a bug or did I do anything wrong?
Thank you.
winbox64_5N438kaw9U.png