RealTime User registred multiple time

Hi,

I use Asterisk 13.1-cert2 and I have about 800 peers on it. After some days running, when I type sip show peers, I notice some realtime peers are shown more than once like that:

xxxx31/xxxx31 10.110.1.101 D No No 5060 OK (96 ms) Cached RT
xxxx31/xxxx31 10.110.1.101 D No No 5060 OK (100 ms) Cached RT

At some points, I can find 3 instance of the same peer. Have you ever saw that issue??