MargaretSmith do the answer above not help you? As already stated, the Best Answer extension makes this change. If you unintentionally selected those tags for Best Answer, you can change the Best Answer configuration. If you want to use Best Answer but not change the text, use the Linguist extension to customize the translation.
If you need additional help, please start your own support discussion and include your php flarum info output so we can see which other extensions you use.
