According to wiki-
http://en.wikipedia.org/wiki/KWTV-DT
After the analog television shutdown has completed, KWTV-DT returned to channel 9. In October 2009, due to reception problems in certain areas of Central Oklahoma, the station was granted permission via special temporary authorization by the FCC to operate an alternate signal on its former digital channel assignment of channel 39, using the virtual channel "9.2".
On March 9, 2010, the FCC issued a Report & Order, approving KWTV's channel change from channel 9 to channel 39.[2] On April 20, the station filed a minor change application on its new channel 39 allotment, [3] which it was granted on June 10.[4] Once the station files a License to Cover, then KWTV can terminate operations on channel 9 and operate solely on channel 39 permanently.
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Maybe KWTV is going through their last bit of tweaking to get their digital channel just right. It appears in the tvfool listing as channel 39 with no digital channel. 9.1 is transmitting on real channel 9 and 9.2 is on real channel 39. Once they have got everything right with their new transmitter is will appear as 9.1 on your tv.
Confusing yes, but it won't take too long before they get everything working just right.