Hi to forum.
Which one is real?
I believe htop but too much difference between the other 2.
IDK, but if you also make a conky for CPU use then you have 3 different values.
Its just a time problem I think from read (every one, two, something second) and display the values.
But of course I can be wrong
Check the output of free
and compare the various values with what you see in the other applications.