Right - so it is possible there is NO problem here by not achieving the CV/absorb value if the battery is already fully charged. Accurate or not, the "resting voltage" (no charge) is what may be confusing people when they see that in the display.
If the batteries are full, many charge circuits immediately detect that there is no need to go into CV/absorb, and drop to float or stop. (It senses this by measuring so-called the CV tail-current. If that tail current is low, it immediately drops out of CV if it has reached it for the first time, or has been allowed to time out.
Do a capacity test, or simply try to discharge it. Not necessarily to an empty LVD, but significant enough to force the recharge to reach your CV/absorb setting. (or boost, or whatever name they want to use for CV these days).