You might have noticed there was an update for the minimap today. It fixed some spelling mistakes in comments, added a “How to use.txt” in Content/UMGMiniMap/Minimap (you only see it in the windows explorer) and should have fixed incorrect behavior of the minimap if a landscape is used which origins are not at 0/0. Unfortunately I noticed the update did not fix it but instead also introduced a possible bug if no landscape is used. You most probably won’t notice it, but since we have weekend now I can’t submit a new update to Epic at the moment, if you have any problems just contact me and I will send you an updated version or show you how to fix it yourself (it’s actually only one wrong node) 
Awesome! Have fun 
Your game looks awesome, I’m really curious on how my Minimap will look in it 