DIY Envelope/Printer Issue

I am having a MAJOR issue with printing my RSVP envelopes. It will print fine, then leave a smudge of blue or red or black ink on the edge.

This has not been an issue for any other parts of the invite that I printed. Any suggestions, because I am getting desperate!

Try printing any regular size document in between printing a batch of envelopes. I did that b/c the same thing was happening to me. I would print 20 envelopes and print a regular page and repeat