the gwt-PopupPanelGlass height increase unexpectedly

as show in the image, beforesearch, there is no scrollbar in the right hand side, and then press search, in the searching.png, it show a warning message, and after press ok, the result is shown (result.png), but one point very strange, in the result.png, there is a scrollbar in the background right hand side, and I check with F12 in IE, the reason is the gwt-PopupPanelGlass height expanded, why will this occur?

if I search less record, let's said the result only has 3 records, the background right hand side scrollbar will not be shown, and the gwt-PopupPanelGlass will not be expanded when check by F12 in IE.

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