Formatting mysteriously keeps changing

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Registration date
Thursday September 30, 2021
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Last seen
September 30, 2021
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Hello,

Yahoo keeps changing the size format of my text without my permission. For ex., the entire body of an email is supposed to be written in Modern medium. Instead, a couple of paragraphs are Modern small. This gives my emails a very sloppy look.

The formatting change happens even though I do not copy-paste text from Word or other websites. I avoid using the "Switch to plain text mode" because reverting to plain text removes URLs etc. which is not handy.

I use Chrome and the same problem happens with other browsers. I sure would appreciate some help! Thanks, Margaret