I had two 10m Qs when I only worked them once. When I went to submit the clublog, I filled in both with the time I worked them the once. It then filled in the exact times from their logs which were one and two minutes off from what I entered. Which means, they logged my one QSO twice and our clocks were off from each other by a minute. No biggie.
BUT, how you got logged on 40m, when you didn't work them... I dunno. I'd put the times of your 30m QSO in there and see if those match. Which would suggest they mis-logged the band, then fixed it and re-logged as the proper band, but didn't go back and delete the incorrectly logged QSOs. It's possible!