IPSEC SA lifetime problem

Hi, I have RB951-2n, 5.20 software

I want to set under “/ip ipsec proposal” liftime=1m. So when I set this value and flush installed-sa, only first pair of SA show proper value of lifetime. After some time, too many SA are shown, and all have same 48/60m lifetime (expires-in=30m49s add-lifetime=48m/1h).

On the other side of ipsec tunnel is cisco router with 1m SA lifetime and work fine when peer is other cisco router.

Does anyone have solution?