Steam seems to be obeying the splits here, are you having this issue with any other applications as well? Thanks!

Do you have any on your Compatibility tab in DisplayFusion?

We'll need to test this more internally. In the meantime can you submit your debug info so we can test this further? Thanks!

• On the DisplayFusion Settings > Troubleshooting tab, change the Logging drop-down to "L1: Log Minimal" and then click "Clear Log"
• Reproduce the issue and note the time so we'll know where to check in the log file
• Click the "Export Info to File" button on the Settings > Troubleshooting tab
• Reply with the file attached
• Disable debug logging after sending the log