This behavior is due to a precision loss. The interpolating functions that calculates the point position on the graph area based on its coordinates, works with float numbers for performance reasons. Given that the differences between the numbers are < 0.00001, converting the numbers to float produces the same float output for points that are close to each other.
I believe the latitude delta should be 0.00001 instead of 0.0001, because 0.0001 decimal degrees latitude equals to ~11.1m at the equator. If the points' differences are of the 0.0001 scale, they should not overlap.
However, the Map item is not designed to be used in scenarios where such precision is needed. Its purpose is to be used to display aggregated data over geographical regions, rather than showing points at a precise locations. Of course, if such a feature proves to be important for our users, we will consider its implementation, that's why you can log it in our Feedback & Ideas
portal so the community can vote for it.
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items