I've noticed a few system bugs, but one of the biggest that I wish they could fix for a long time is under the profile page, in the interests category. Here people list their interests and it supposedly hyperlinks to others with the same interest.
Whenever I click on an interest, it says there's (for example) 30 pages of people with similar interests, but all pages have virtually the same people. So either the number of pages is incorrect, or the hyperlink is not working properly and we're missing out on dozens/hundreds of potential connections to others with the same interest
If you are clicking on an interest and that interest is pretty general, there is a pretty high chance that allot of people will have those same interest.
So you are seeing people with similar interests, ie a trend, thats a good thing, that means that those people have multiple similar interests.
After you click on an interest at the top of the page of profiles you see there are criteria that you can choose to filter the selections, so if the same person shows up 1st with one interest, then they are going to show up near the top again, unless someone else has the same interest and is closer to the criteria set in the filter/s.
If you want to make sure there is no bug, just go look at their profiles and if that interest in not on their profile then you have a bug, but if that interest is also listed on their profile then no bug.