When scrolling mail content email list scrolls too

Binary package hint: evolution

When scrolling the inline email preview (standard evolution layout) with the mousewheel to read the email the list where it shows the emails scrolls once every 10-20 mouse wheel scrolls. Doesn't happen all the time and I can't seem to find a way where it happens definitely.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: evolution 2.32.2-0ubuntu7
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
Date: Sat Jun 4 08:33:03 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/evolution
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcEnviron:
 SHELL=/bin/bash
 LANGUAGE=de_DE:en
 LANG=de_DE.UTF-8
SourcePackage: evolution
UpgradeStatus: No upgrade log present (probably fresh install)