log entries appear in wrong order

Steps to reproduce:

1. Create file numbers.log with `seq 1 3000`.
2. Observe that file with log[numbers.log] or logrt[numbers.log].
3. Sometimes, in "Latest data" numbers appear in wrong order. For instance: 1-297, 798-893, 298-797, 894-1497, 1998-2075, 1498-1997, 2076-3000.