Uneven load balancing - Least connection (member)

I have four members in a pool, source address persistence 20 minutes and least-connection-member. Out of four only one has all connection. Checked persistent record and connection table for my ip none for that vip.

I send request to the vip, the request should be load balanced to the member having least number of connection. But still my request is sent to the member that has higher number of connection.

Is this some kind of bug on the code. 11.4.1 HF8.