After executing: /spreadplayers 1 2 3 4 true @s

The output was shockingly:

[21:00:15] [Client thread/INFO]: [CHAT] Spread 1 teams around 1.5, 2.5 with an average distance of 179769313486231570000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.00 blocks apart

of course, something is wrong with that.

See the attachment for more info.