You mean, if picture(event) did not dissapear after event ended?
I think i did not seen any item to fix this in game.
In RPG maker there is command to clear screen, it is often made in fix command or item for fixing this.
If you can unpack the game, install RPG Maker MV, Open RPG Maker MV, ad create any game project, after you save it it appears in older which you selected, take from there rpgproject file, after you unpack game files add project file to WWW folder, you can run project by launching it with click on project file or by launching it via RPG Maker MV, add item (Fixer), add common event(Fixer) and add there option for run this clear screen function and after use exit menu of this item.
This is option if you can spend time yourself.
Second and faster option is to find save which is still do not have this bug. And play from this save.
There is no way somehow to fix this via save i think. At lest i did not heard about it.