This bug is due to the method fvwm uses to display the geometry feedback, and is largely outside the control of compton.
Please see the discussion in this upstream bug report[0], as well as a workaround (using fvwm event scripts and compton's dbus interface to disable redirection while resizing is taking place). Please try this workaround and let us know how effective it is. If it works, I can't see an easy way to add it to the package, but it might be worth a mention in the manpage. [0] https://github.com/chjj/compton/issues/41 -- Regards, Scott Leggett.
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