missing data in online map

My recent map is missing a square of data in the online map viewer. The elevation data,TIF and 3D image are all complete.

Any reason why this area would be missing? It is not the end of the world but its handy to be able to share the link..

https://www.mapsmadeeasy.com/maps/public/9247d790cc7941b3abc91f1f8436bbaa/

JB