"Status" is the status of that specific membership record, "Current Status" is the status of the member.

For example I am a member who purchased a 12 month membership on 2/1/2019. I then purchased a renewal on 2/1/2020. On the 2019 record my "Status" would be "Inactive" and that membership has expired but my "Current Status" would be "Active" as I have purchased a new membership that is currently "Active".

You can always select Summary so that each member has a single row rather than the details of each purchase.