The first row shows the results on only those sentences which the conversion process can convert sucessfully (as measured by converting gold-standard CCGbank derivations and comparing with PTB trees; although, to be clear, the scores are for the CCG parser on those sentences).
the second row shows the scores on those sentences for which the conversion process was somewhat lossy, but when the gold-standard CCGbank derivations are converted, the oracle F-measure is greater than 95%.