So until now, i realized that if you use the url code and use the bold font code inside it, it shows up black but not blue, but if you use the bold font code outside it, it shows up normally.
This happens only with bold text, at least from what i tried so far. :l
Examples:
Text[url=http://www.postimg.com][b]Text[/b][/url]
Text[b][url=http://www.postimg.com]Text[/url][/b]