Odd behavior on TUNE

Doing my job as a "pre-release" tester.... 6500 / flex control knob, Win-8, running current 0.13.10 software. I noticed when I had two pan windows open, one on 80 meters and the other on 10 meters, and tuned just outside the high end of 80. I hit "tune," and it didn't transmit (as expected.) But when I turned the flex knob back into the band, the rig went into "tune" mode without my hitting the button. I have repeated this several time in order to diagnose it. If I hit "tune" once, it goes into tune mode but doesn't transmit - the receiver is still operating - and if I dial back into the band the rig goes into "tune" mode. If I hit "tune" button twice, it toggles back into receive and does not go into "tune" when I dial back into the band. No biggie, but could cause a problem. Ken - NM9P