Expense approval based on amount

I want to configure amount based approvals for expenses where the approval process stops once it reaches amount limit.  have followed your setup in our test environment similar to what you suggested  in the forum. i have 2 employees with different profile tied to same amount limits ( E1 reports to E2 and E2 reports to E3).

a) E1 - 0.00 to  500.00

b) E2 - 501.00   to 1000.00

b) E3 - 501.00   to 1000.00

I have transaction for 500 but when i submit is showing all the folks in my approval path instead of stoping at e2. How can i configure to make it stop only at E2? i am using same approver type these 3 profiles.