Ok, haven't seen this before so unsure if it's a bug, or just me being Unobservant.
But on the Mindanao map I found what might be 3 things need fixing.
At A69, the GV spawn arrows point 3 ways, N, NW and SW but (besides the Hangar button) there are buttons for N,NW,W,SW
At V72, arrows point NW/SE but have NW/N/SE buttons (in addition to hangar)
At V73, arrows show N/SW spawns, but buttons for N/NW/W in addition to Hangar..