Sometime when users access same web site resource they get swapped responses.
What should happen:
User A request: site.com/getOrderList => User A get: User A content data response
User B request: site.com/getOrderList => User B get: User B content data response
What happens sometimes:
User A request: site.com/getOrderList => User A get: User B content data response
OR
User B request: site.com/getOrderList => User B get: User A content data response
In this case, one user can see the order list from other user.
But, if I click homepage button everything becomes normal again.
Swapping responses happens for one request only, in the next request the user will receive the correct response.
I can replicate the problem locally in IIS Express with automated tests, but the problem is intermittent.
If you need more details just ask.