Sketchup sometimes loses it path when you edit a sub-component causing the part to appear to fly away from its expected location. When this happens, clicking on the fly-away part will usually bring it back into position, but if it doesn't, you may have to save your work and restart Sketchup. This is display problem only and your model is not corrupted.
Please see Validate Component Redraw to see how CabinetSense fixes some of these issues.