Every time my workshop relegated aged flooded marine battery would read and maintain a high surface charge of 13v or higher many many hours off the charging source, I knew it was low on water.
Seems some responders think you batteries are still on the charging source, reading that voltage, so perhaps some clarification is needed, for them.
I've never seen surface charge retainment over 14v for more than a minute or 2, on any 12v battery. So how long off the charger are yours maintaining 14.18v, and what is their temperature?