Edition Engine on IE6: some terms are often displayed below the left menu of the engine

I often see some terms or texts on my IE6SP3 being displayed at the bottom of the edition engine. It looks like a layer is reused or badly positionned and some finishing text from the main engine view is redisplayed under the engine's menu.

The exemple illustrates a menu which is waiting for validation with the "simple" term which suddently appears both in the main screen and below the engine's menu.