Sidewalk problems

Is this a settling problem?

Was there Proper drainage? Looks like erosion . Or Past owner weighed 800 Lbs.

Agree looks like erosion.

Curious also there is no expansion joint at that location…

looks like a poor concrete job to me…If you look you can see the form marks on both sides and if this is against or part of the stemwall they forgot to complete
the concrete footing behind it…Unless Im seeing things…What is above that???