(a) clicking (and holding) the handle moves the window contents one line
down,
(b) optional: when dragging the handle there are display quirks,
(c) releasing the handle moves the handle up.
Are you using a mouse button which ought to drag the handle? If so, I
think we see two bugs here. (a) is a bug and (c) is a bug.
If you can develop a precise test case, and report it in a single
self-contained message to emacs-devel, someone will debug it.
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