Dear @MJamshidnejad,

Thank you for your report.
It is normal to have extra usage, but I have to enforce Remaining to show Zero or - instead.

Oh good point. I forgot to mention that. :) That problem is also exist in subscription reports.
Why is it normal? connected connections?

@MJamshidnejad it is normal in all accounting apps, because it is not possible to check the usage of the user on each millisecond or each byte of usage :)

This conditional code in subscription will avoid minus number:

if vol := stats.Total - (stats.Up   stats.Down); vol > 0 {
    remark = append(remark, fmt.Sprintf("%s%s", common.FormatTraffic(vol), "📊"))
}