I wish the following problem will be fixed :
We are able to see the issue when retrieving group membership datas if the group have multiple users having the same name and get membership with multiple offset.
For example, there are two users having the same name and both of users is a member of the group. If we request all of membership for the group with multiple offset, the endpoint of group may only include one of both, not include another user in the response.

I have submitted this incident to Box support ticket(#2387523), and received an answer that the engineering team of Box do not believe the impact of this is significant enough to prioritize at this moment...