Question

There seems to be a problem with HTML. I will investigate it.

Answer 1

This is my vote notification email

Comments

Yes. Because HTML is collapsed, appearance will vary depending on the browser (email client).

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My investigation progress:
This problem does not seem to occur in Japanese. It may be problems related to lang filter plugin. I will examine a little more.

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My expectations seem to have been wrong. I had disabled lang filter plugin on this site. Problems still occur. It might be a problem of the NP itself.

Answer 2

This was a bug of NP. Program was fixed. This site has been also fixed.