Unexpected persistence result

Platform: LTM2000S, 11.4.1HF3

While troubleshooting an unrelated problem, I noticed an unexpected persistence happening. Two servers (out of many) connect to a pool of 4 members. Default source_addr persistence is configured, which results in the traffic of these two servers being loadbalanced over a maximum of 2 members, as expected. However, when I look at the persistence records, it seems that not all traffic from the same source address it sent to the same member. Is this normal behaviour?

source-address  xxx.xxx.xxx.50   10.10.88.46%20:443  10.10.129.30%20:443  (tmm: 2)
source-address  xxx.xxx.xxx.50   10.10.88.46%20:443  10.10.129.30%20:443  (tmm: 3)
source-address  xxx.xxx.xxx.50   10.10.88.46%20:443  10.10.129.30%20:443  (tmm: 1)
source-address  xxx.xxx.xxx.50   10.10.88.46%20:443  10.10.129.29%20:443  (tmm: 0)
source-address  xxx.xxx.xxx.51   10.10.88.46%20:443  10.10.129.29%20:443  (tmm: 2)
source-address  xxx.xxx.xxx.51   10.10.88.46%20:443  10.10.129.29%20:443  (tmm: 0)
source-address  xxx.xxx.xxx.51   10.10.88.46%20:443  10.10.129.29%20:443  (tmm: 1)
source-address  xxx.xxx.xxx.51   10.10.88.46%20:443  10.10.129.30%20:443  (tmm: 3)