Have you uploaded them yet? Sometimes when some go into the correct cemetery and some go into an 'undefined' cemetery it's the result of an intermittent GPS signal. When you upload them the BillionGraves software sorts them back to the cemetery where they should be.
If that doesn't happen automatically, you can still change the cemetery that your photo belongs to in the 'Transcription Page'...by scrolling all the way down to the bottom of the page under the photo and clicking on the 'Cemetery' drop down menu and picking the correct cemetery (as shown below).
Hope that helps,