Thanks for replying to my question. I'm afraid I wasn't clear enough.
If you look at the first two pictures, it shows 3.99TB written so far. One would expect that later on, it would show 4.00TB, then for instance 4.05TB and so on. But on second two pictures it just shows '44GB,' it basically started to count from zero again (as if it were brand new unit).
Looking at picture with SMART values on different drive, it is counting correctly (and already shows way more than just 4TB):
Thanks for verifying this. I'm glad it is known issue and it doesn't have side effects. Though I doubt Intel would actually provide any firmware update for 510, considering there were no public updates ever since it was released in 2011 (see Intel SATA Solid-State Drive Firmware Update Tool).