PuTTY/KiTTY/etc. have an option to bring up a right-click menu with a Paste option in it, rather than instantly pasting.
The problem with this is that if there is a selection in the terminal then that selection is pasted, rather than the contents of the clipboard.
This is obviously bad behaviour and seems to be a problem related to the interaction of the xterm versus a proper Windows app? How can we disable this "function"?