When I go to my "History" tab then a couple of previous transactions are listed.

Two lines contain in the "EUR Value" column a value of "No Data".
All other lines (before and after) show the corresponding Euro values for the bitcoins.

Why is "No data" shown?

How can I "repair" this?

BTW: Is the Euro value calculated for the time the Bitcoin transaction was performed (in the past) or always with the current exchange rate?