Since the last forum-software upgrade approx. a month ago, it happens a lot that 1 or 2 spaces after a link (url) are being hotlinked, causing malfunction of that link.
Most probabely it has to do with a 'bug' in one or more of the forum-'editors' being used by our members. Vatsis is still trying to work it out.
In case this 'bug' has been bothering you, the best temporary solution is to always hit the 'Enter'-key immediately after you have typed the link.