This is a fairly common question that gets asked. Essentially those suggestions on the right are for the best gear that you can get, but the recommendations in BiB, including the gems and enchants, are what is best for the gear you have currently. They don’t always match up.
If you open up the “View optimal stat graph”, it will show you what combinations of stats are better than others, and often, you will see a spiky graph where very different levels of stat combinations provide essentially the same amount of dps.
Swol made a forum post about it a few years ago, which explains this in more detail.
As eighjan mentioned, provide a snapshot ID, and the AMR team can investigate it, and help explain whether the results you are seeing are correct or not.