First, don't worry - your Leaf is likely fine. The range estimate is based on most recent driving, so it changes with a new driver. It is also VERY inaccurate for many drivers, which is why we refer to it as the "Guess O Meter." Your Leaf should have a State of Charge (SOC) display option, and that is your best bet for knowing available range. If you have an SV or SL you also have a more accurate range estimator available in the Navigation system.
Now, about terms: I assume that when you write "v" you mean Amps, or "A", rather than "volts". Going from a 16 amp charging cable or station to a 34 Amp unit won't harm the car - the onboard charger is limited to, at most, 27.5 amps regardless of how much a charging station "offers" it. This is much less than a Quick Charge station provides, so heating isn't a problem. (What you have is a Level 2 or "L-2" charging station.)
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.