I wouldn't be too worried about the numbers Peter. Off charge voltage measured is a vague indication of state of charge at best given the variables of load and residual surface charge, and no indication of charge capacity.
That the charger is on and functioning is the only really valid concern. Extra charge can sometimes be added by re-cyling charger off/on which in turn forces it back into the higher voltage absorb from previous float mode, given the charger may drop into latter prematurely.
