Font size changes automatically in the rich text editor

Hi everyone,

I've found a bug regarding the RTE, after making some changes to the text, the bolded text changes the size without actually changing it. I'm using AEM 6.5 on-premise with SP 6.5.15.0 (it was reproducible before as well). Any idea about this?

Here's how I reproduce it:

1. Create an RTE inside the page, enter some text in it
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2. Set a word as bold, and separate a sentence into a new line, like this
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3. Now, when I remove this new line and return the text as it was (with the bolded word), a style is added to the bold tag setting the font size to 0.8125rem
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Any suggestion here would be great. Thanks