Hidden artefacts appear when selecting text on PDF saved from InDesign file
We have a document that was designed in InDesign. After it is saved as a PDF, when a person tries to select text, hidden rectangles all over the page appear and are highlighted, jumping back and forth from unhighlighted to highlighted. There is nothing there to be highlighted. We've made many similar documents and not had this before. We want people to be able to copy text from the PDF if needed. Currently this is impossible. Why is this happening?
