When I download a design as a PDF that uses a clipping mask, there are weird lines or the image is showing outside of the text/shape. How can I fix this?

Some PDF viewers don’t support a clipping mask. For this reason, we recommend selecting Flatten PDF when using a clipping mask (see Saving & Printing Options under the Info tab). This will flatten the elements in the design when downloaded as a PDF, thus eliminating the problems associated with PDF viewers and clipping masks.