This NJ 2014 article shows how a bridge built in 2005 had severe problems already requiring millions of dollars to repair.
https://www.nj.com/salem/2014/02/44_million_project_to_repair_sinking_approach_on_route_49_bridge_linking_salem_pennsville.html
What is up here as well as other locations that suffer from similar happenings in short time? Nine years is a very short time for something like this to happen. Either poor geology check, or carelessness by M&M Construction who built the bridge.
Look at the photo in the article and you can see that severe problems were present.
It's hard to properly compact soil around bridge abutments. This isn't a new or uncommon situation.
A lot of states use approach slabs to cover over the first part before the abutment and/or use asphalt to make it easier to correct problems if there are some. It looks like this bridge has an approach slab but there were still settling issues, which again, isn't uncommon.