Pop_OS shows me the size of the partition incorrectly

I have increased the size of the partition of my Pop_OS installation (/nvme0n1p4) from 128 GB to 650 GB using Gparted (from the live USB stick). I have set it exactly to 650 GB.

But in Pop_OS I now have the problem that I am shown three different sizes:

• The command fdisk -l tells me that the partition has a size of 634.8 GB.
• The app "disks" tells me that the partition has a size of 682 GB.
• The app "Stacer" tells me the partition has a size of 624.2 GB.

I am now a bit confused and would like to ask you if anyone knows a solution or can at least tell me which indication is correct. I mean, if this indication is wrong, is the information at all correct, how much space of the SSD is already used? I also see different specifications there...