FAQ/Smooth Resize on Float
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5.3 introduces the ability to do smooth resizing on float images (using newer OpenGL extensions to do it). However, there appears to be a problem with the smooth resizing with single channel images. They appear to be displaying 3 times brighter than they should be.
So to fix the issue, in the Tweaks preferences, set the "Smooth Resize" option to "int". This will stop it from doing smooth resizing on float images, and it'll be back to the way 5.21 was for that.
This issue has been resolved in Fusion 5.31 --Gringo