Catys and zhid links are the same. Remi link has an extra part to it which may cause the problem combined but if you highlight just the URLs they work guess it depends on how you copy the link.

remi this one gives the error but is very close to mine but the error is highlight in green. Make sure you don't copy the last forward slash, after a .html or introduce one.
Code:
Please Login or Register to see the links
cats and zhid these work.
Code:
Please Login or Register to see the links
My copy and paste and it works also.
[Only registered and activated users can see links. ]

Code:
Please Login or Register to see the links