As below is the reply from our developer.
I think your problem is caused by incorrect ZoomLevelSet.
The different maps use its corresponding ZoomLevelSet, please choose the default ZoomLevelSet or SphericalMercatorZoomLevelSet for MapBoxOverlay.
I create a MapBox demo attached, but unfortunately I can’t recreated your problem.
8398_MapBoxTest.zip (1.7 MB)
If the sample still can’t solve your problem, please give us more detailed information or upload a simple sample which can recreate your problem.