Can you clarify where you are creating the segment? In AEP or AA? In AEP, the segment numbers are "profile count" which is an estimate and depends on the unified profiles. So you cannot compare the UVs from AA. If you are creating segments in AA, then the bulls eye chart represents the qualifications for a different period of time. So you need to select the right date range in the reports. Still your reports might include current data, where the numbers will be a little off.
If your question is for AA, then this needs to be moved to that thread, instead of AEP.
Let me know if this is the case!