The older data doesn't migrate

[rayxxxxx]

Goodmorning and, first of all, I'd like to say you thanks for your precise description (a great job).
I followed the steps to migrate my DB from InfluxDB v1 to InfluxDB v2 and I didn't catch any error. I didn't set start and end parameters.
The issue is that in InfluxDB v2 I've got just 3 days of data and I lost the older (my destination bucket doesn't have limit of retention policy). The export file was approximately 112 MB (I think it's all data).
Why happened? How can I solve?
Thanks for your help!