Can you show a screenshot of the source view for the 9.1 import?
From experience, I can tell you that often the cause is nodal/calculation values (e.g., month if the data is by weeks) in the source. They are not loaded because they are recalculated in the model anew. That is why they are ignored.
Displays the total points for all stories in the sprint. Story points are arbitrary measurements of the effort not necessarily the time required to complete a story, based on the estimates of scrum team members. The default number in this field is zero - change the number to ensure that Completed points and Team points are calculated correctly.