Vertical toolbar resized horizontally

ReactOS installed from bootcd-70206-dbg.iso under VirtualBox 5.0.10.
Testing my application – UKNCBTL emulator https://github.com/nzeemin/ukncbtl/releases/download/release-1.0.552/UKNCBTL-552-exe.zip
I found that in Debug mode of the emulator Debug window toolbar overlap a big part of the Debug window (see screenshot).

The code creating the toolbar is the following:
https://github.com/nzeemin/ukncbtl/blob/master/DebugView.cpp line 110:

m_hwndDebugToolbar = CreateWindowEx(0, TOOLBARCLASSNAME, NULL,
WS_CHILD | WS_VISIBLE | TBSTYLE_FLAT | TBSTYLE_TRANSPARENT | TBSTYLE_TOOLTIPS | CCS_NOPARENTALIGN | CCS_NODIVIDER | CCS_VERT,
4, 4, 32, rcClient.bottom, m_hwndDebugViewer,
(HMENU) 102,
g_hInst, NULL);

So, the toolbar created with style CSS_VERT and with width 32.
Under Windows, the toolbar looks fine.
But under ReactOS, the width of the toolbar was increased by the OS, so now it covers big part of the window.

I think, the bug is somewhere in http://code.reactos.org/browse/reactos/trunk/reactos/dll/win32/comctl32/toobar.c