Turning on high resolution screen in screen extension mode causes window shift

As shown in the attachment, when I turn on the  screen with 1.25 scaling, I open the demo and then using xwininfo I can see that the window appears to be shifted on the X-axis, but I don't have that problem with the demo I wrote in pure X. （I'm using Qt::X11BypassWindowManagerHint in the demo to bypass the window manager.）

Steps to Reproduction：

1.Extending the two screens, the screens are then placed as in Figure 1 in the Annex

2. Run demo1 

3.Viewing Window Information with xwininfo