Eco Worthy  Hybrid 600w Inverter/charger with one of there 100Amp LiFepo

Wire resistance causing voltage drop between the two points you are measuring . Or calibration difference between different devices. i am not clear about your measurements and whether you are using the same measurment device at two different points.
Do you have a meter that can measure voltage and resistance? if you know the current you could use Ohm's law to calculate the resistance.

Was taking the meter readings at the battery it was just worrying to to me as the panel reading on the battery hit 14.9 and the max in on the battery is 14.7 after it finished its charge is was sitting at 13.3 on the panel and reading the same on the battery with the test meter there is no setting on the inverter for a LiFepo just flooded an Agm and a user setting that i have it on where you give it the charge rate and top out voltage that was set to top out at 14.7 its running now with a 120w 10amp load and the inverter and test meter have been reading the same for the past 4 hours so looks to be ok it was just showing that 1 volt extra on the inverter when charging that gave me a little worry it was getting to many volt's

Yes I would worry about too many volts also. . 14.9 is too high for LFP. That is 3.7 volts per cell. I am surprised your BMS did not cut out. I only charge my LFP to 3.45 per cell which is 13.8 volts and they settle to 3.3 volts after charging, which is normal.

Is this the ECO SC60A? if so it most certainly has a lifepo4 setting on pg 8 of the manual

No its a Eco Worthy Hybrid 800w Inverter/charger i was thinking it was only 600w but its 800w and its working fine doing its job it just reads 1 volt full over on its display so when the battery's at 14.6 its reading 15.6 on the display. A bit off an ass but i can live with it not worth the ass in changing the unit with them over it