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Ok, I've tested and confirmed the issue. We'll check into it and I'll keep you posted on what I find out. In the meantime, you can disable Window Snapping for Steam using a DisplayFusion Compatibility rule (http://www.displayfusion.com/KB/TroubleshootingInfo/#createcompatibilityrule).
Note that it will still snap to monitor edges, as it looks like that functionality is built into Steam.