According to the 'Online' panel ... with the red header, in the left sidebar, There are 447 unregistered users and 8 registered users on-line.

According to the panel .... with the revolting yellow/orange/mustard/sick-dog turd-colour header ... to the right ... and slightly below ... that, In total there are 16 users online :: 1 Registered, 0 Hidden and 15 Guests

So, I'm assuming that the LXF website calculations are based on the principle that 1+1 = 2 except for very small values of 1

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N.B. Anyone trying to come it with Fuzzy Logic will get beaten to death with a hedge! - An X.Y = 1 hedge!