Monday doubles my documents when Ithey're moved to another board

Hi, so for my workflow I have the automation of moving my items to the next workflow board once I set them as “Done”. This works well for the first few steps of my workflow, but when it reaches a specific board (that has the same exact automation), the documents I have in the “Documents” column get doubled. I cannot find why this is happening, does anyone know how I can fix it?