[Dx4win] problem with split mode

[George]

I am using a Kenwood TS-990 with the latest software version of DX4WIN.
This morning I clicked on a 80 meter CW spot (3.527 split 3.528) that
indicated a split frequency. I went to memory 1 to send my call in CW and
WOW I heard W2YJ in LSB. 
You can imagine my surprise and embarrassment. 
Till I figure this out I'll have to pay attention to the mode on VFO B.
I have the 80 meter CW cut-off set up in the DX4WIN parameters for 3.6Mhz CW
cut-off.
Is this a TS-990 problem or a TS-990 rig file problem.
Anyone have an idea?

George  W2YJ