are stats flipped once they hit a certain limit?

My brother hit like 64 or 68 sacks with the Browns during an online season. His Sacks were rolled to 4 instead of 68 so we think it reset at 64. Why did that happen? Is there a cap for stats? I mean, if it gets ridiculis at some point does it just say it's rolling back to 0 since it's so high or what? I know it's an unbelieveable # of sacks but it's true. I'm in the same season.

Any one got ideas?

nobody has seen this happen for any stats? passing TD's, Rushing Td's, Sacks, rushing yds, receiving yds, passing yds? it's just strange to me as to why they would flip over to 0 from 68 or whatever the sack count was. Oh well.

Thanks anyway.