Font change in reference following emoji

[nh220]

I am citing a tweet using a custom reference type and a customized version of Chicago (Author-Date) format. For some reason, four letters in the title of the tweet immediately following an emoji consistently appear in a different font (Helvetica) than the rest of the text (Times New Roman). This happens regardless of what emoji I use. It is admittedly a small thing and easy to fix manually, but is there an explanation for why the 'post-emoji' letters are in Helvetica?

In case It matters, the custom reference format is: a (u1). d. “t.” $X.com$, u2, d, u3. z.

u1 is the twitter user name, u2 is the Month?Day, and u3 is the time.

[Jon]

Emojis are complex multibyte characters, manipulating them when formatting is not straightforward. Please post the emoji, they can be quite different. Better yet, send it in an email to support@sonnysoftware.com (or do both) to make sure the encoding isn't affected by the forum software.

Jon
Sonny Software