SKYRC 6X80+ problem

Hi!
It is normal that when i check the end voltage between my SKYRC 6X80+ and the battery 18650 protected (with voltmeter) ,i have 3.99V but i have programmed charge for stop at 4.2, but in reality when i remove the battery and check with voltmeter i have just 3.99v. Same thing when i discharge…

All of my battery is new and i have double checked with an other voltmeter and same shit…

It is a default of my charger??

thanks