When I look at the HTML source code, the two links that do not work are a numbered list. The other two that work are not in a numbered list.
What you need to do is remove the formatting so that it will not be numbered anymore.
(Just make sure before you do anything, that you have a copy of the text so that in case anything gets messed up, you have a copy that you can go back to.)
In the Visual editor, while you are in the Visual tab, try selecting your text by highlighting it, cut it, then click the icon that says, "Paste as Text" (2nd row, 4th icon), then paste your text. That should remove the formatting of the numbers.
Let me know if that helps.