This is an expected behavior when a Pane is made floating. In the RadDocking control when a Pane is made floating it is removed from the visual tree, then it is added to a ToolWindow and then added to the Items of the Docking control. In this process when the Pane is removed another Pane needs to made active and in the case when there are two Panes the other Pane is made active. Shortly after that when the ToolWindow is added to the items of the control the floated Pane is made active again.
I recorded a short video for you showing the described mechanism as it may be easier to understand.
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