Here's what happened:
I played around with multi-quote to see how it worked. I selected a few, but never posted with them and moved on.
A few days later I went to reply in a different thread in a completely different forum and up popped the multi-quotes from days previous.
Better than having multi-quotes time out if not used, I think if a person selects MQs and does not use them, as soon as the user exits reading that thread, the MQs (selected) should disappear.

