Card Sorting Tests

I have conducted my card sorting tests but am yet to analyse the results. I think most test participants organised the cards similarly. In just one of the tests two cards remained unsorted as the participant was not sure which category they belonged to. I had already explained to the participants to leave whatever they think cannot be sorted under the existing categories in the left hand side window.
I have attached the screenshots of the completed tests. It shows the cards already sorted out. I will also try and upload the recording of one of the card sorting sessions, if I can.