Bold link adds closing tag in href attribute http://i.imgur.com/EHX3Z.png and links gets wrong.
Could you please post the full content of the task you're referring to? Please note that <b> </b> tags are not supposed to be used to format text in Todoist. The supported text formatting methods are:
This is !! bold text !!
This is __italic text__
Yep, I forgot space after and before !!