msg_your_scan shows old and received msgs to me but previously QWK-downloaded

I usually download QWK packets to read/write mail. Recently, I have started trying to read my mail in synchronet. When I choose the msg_your_scan option from the menu, I am shown a whole lot of old msgs to me that were long since read via QWK. It would appear that QWK downloads do not flag personal msgs as received and/or msg_your_scan is not interpreting them as already received.