While working on an issue for a user using MacroUVs, I noticed that entering any value into the Required Module with Override Default Macro UV toggled true will cause the Material to stretch and distort.
1. Open attached MacroUV.uproject
2. Open the Particle System
3. In the Required Module, toggle the Override MacroUV
RESULTS: The Material stretches and deforms
EXPECTED: Nothing should happen as both are set to 512.
Head over to the existingAnswerHub thread and let us know what's up.