Player marker is present on the overmap multiple times

[snipercup]

While scrolling on the overmap, you can see the player marker multiple times.

Steps to reproduce:

• Open the overmap
• Scroll way to the right
• Scroll way to the top
• Scroll way to the left
• You have observed multiple player markers.

I think it places the player marker on the same coordinate in every overmap grid. It should only place it once, on the grid that the player is on.