Often when copying from another source and pasting into a new post, the copied text will convert all the BB Code and display it in the message.
Errors often occur when the font used is not supported on the forum, especially with different sized text and bolded fonts.
If you've already posted onto UA and find garbled text, then THE easiest way to fix this is to:
>Click Modify - to modify your post
> HIGHLIGHT ALL THE TEXT,
> then click the button as in the pic below...
> then click save.

This will cause the message to display properly. Now if you want to Bold some text and stuff, you can still edit and do it.