Oh boy...
See all those entries with the "Discover" button? Those are failed pairings that never completed and then you tried again, and again, and again, and finally got it to work from the looks of it.
First step is going to be to try and get rid of as many of those as possibly the normal way. First open logs on a separate tab/window. Click REFRESH ONCE, wait for page to reload. Find device again, if it does not have a REMOVE button, press REFRESH AGAIN. May take 2-3 refreshes to get the remove. Once you get the Remove, again, click it ONCE and wait. You can watch the logs for a success or fail message.
Do not get hung up on ones that are stubborn, just try and remove as many of them as you can first. This should help get you going a lot better even if you only remove 50% of them.
This post a compilation of a bunch of info about the subject including how to forcefully remove the stubborn ones with other software: Z-Wave Ghost Removal using a UZB-Stick - How To
