looks like this -Fixed: engineer kit sometimes showing multiple model previews when placing an engineer item doesnt work. i even get some wrong previews:
i've had all of these happen to me and i think even the odd enemy camera placement preview flying around i've had wall model previews flying around as comm as well i think, but i have no idea what causes that but to produce a preview of wall that stays there: go to place a wall then right click to abort and the model should stay there even if you switch weapons