Notice changes font in certain module areas

[Carrfixr]

I made this notice and found out that the <b> made some font values bold in other page modules. Why did this bleed over into other forum areas?

<center><b>Exclusive Painting, Finishing Workshop Opportunity<a href="https://www.xxxxxxxxxxxx/forum/model-a/102405-paint-finishing-and-training-seminar-9-13"><br>Link to Info!</a></center>

[Carrfixr]

These areas became bold

[Mark.B]

You haven't closed the <b> tag.

[Carrfixr]

Thanks Mark!!