Row header max value

I'm playing with v.1 and I've discovered that in v.1.0 if the data array has more than 1000 rows, the counter (auto inc number in row header) doesn't display number >999 properly. I mean, that for the rows ... 998, 999 the counter = 998, 999 but than for row 1000 the counter value does become 1000 but 1
How could I fix this issue?

Thank you in advance