Get a volt meter and check the voltage of your cells and the total for the battery.
The conditioning mode may have discharged the batteries to a point below the programming for the charger.
Minimum voltage for each cell should be over 3 volts, below that and you may have lost that cell.
Sometimes with a adjustable charger you might put a small (50 ma) charge into a battery and bring it back up. Problem is, at least for me, it seems that battery will not preform light it did before. I use these batteries for running LED lights.