This is the expected behavior. A year or so back code was added specifically to the product to treat all countries as distinct regardless of the data supplied to the data well which results in the behavior reportedhere.
This was done because countries have complex boundaries (polygons) which are known to overwhelm browsers and cause them to crash. This limit was put in to prevent this.
Right now this is considered a Known Limit. Work is underway however to generalize these polygons such that we may be able to remove this intentional limitation.