Links in Comments Aren't Always Clickable

I use wpDiscuz on my private site. Members add links in the comments on almost every post. Sometimes a link is clickable for one member and other times it is not for another member. I thought it might be because some add leading text before the link and others didn't but that isn't it because there are some members who use leading text and the link is clickable and others it is not.

Since there is no toolbar on the comments members have no way to make their links clickable.

Any help with this issue would be greatly appreciated.