Excess number under each member profile in "Users" (Chrome, iPhone)

rustam-was-here

#1

When I navigate to “Users” list in mobile version I see some number under each member profile. I don’t understand what does it mean, maybe it’s some internal user ID or something like this but I suppose that this number displaying isn’t necessary.

Reproduces on iPhone SE, Google Chrome version 66.0.3359.122.