The software that is generating the link with trailing dots and underscores is creating links that are "copy/pasted parsed" differently in different browsers (Chrome/FireFox/IE/Opera) - also, different internet softwares will see those links differently (vBulletin/XenForo/SMF/UBBT and Facebook/Twitter...etc)
Have a quick read through #2 and #5 @
https://www.ubbcentral.com/forums/ubbthreads.php/topics/255500#Post255500And the last few paragraphs @
https://www.ubbcentral.com/forums/ubbthreads.php/topics/255750#Post255750Then contact the support site for the
wiki software (?) that is generating those links. As them to sanitize their string before making it into a URL.
EDIT, to also include:
http://www.dns-sd.org/TrailingDotsInDomainNames.htmland some additional reading at:
https://bugzilla.mozilla.org/show_bug.cgi?id=134402