Map Landscape Turns Red After Some Maps

After completing Synthesis maps, Tier 16+ maps and Incarnation boss fights, returning to my hideout causes the map landscape to get some strange red particle-like effects, even though map transparency is set to zero.



Only noticed this after those specific maps and it goes away after re-entering and leaving the same map or switching to a different zone. I'm using the Glacial Hideout in case that is related.