[Elecraft] K3 switching to split freq question

[K9RBorowski]

I noticed this evening that after working a station on 18 meter SSB, I saw a spot on the DX packet reflector for XW1B on 20 meter CW. Curious if I could hear him, I double clicked on the spot and DX4WIN sent the rig to his frequency, which was stated to be 14,005.00 QSX 14,006.20 perfectly, or so I thought....When XW1B finished the present QSO, he said QRZ NA UP. He was S9 at my QTH and I thought I would see if I could work him. Imagine my surprise when my keying was doing nothing! Upon a bit of further observation, I found that the QSY frequency on VFO B was in the SSB mode. To correct this I pressed the A=B button and then the A/B button and dialed the QSX frequency back to VFO B, where the mode was now stated to be CW. I used A/B once more to return to listening to the A VFO just as I heard "NA UP" sent my callsign once and worked him on the first call. Is it something that I am doing wrong or is this a bug in the PC control of the K3 ?  I am using a conventional serial port and DX4WIN software. I've only had the rig a couple of weeks and this is the first problem I have encountered. Anyone else experience this or have a solution? 
Thanks for your time and vy 73, Rog-K9RB