From mboxrd@z Thu Jan  1 00:00:00 1970
From: Denys Fedoryshchenko <nuclearcat@nuclearcat.com>
Subject: Re: ipset losing entries on its own
Date: Wed, 06 Sep 2017 13:37:06 +0300
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Cc: netdev <netdev@vger.kernel.org>, netdev-owner@vger.kernel.org
To: Akshat Kakkar <akshat.1984@gmail.com>
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On 2017-09-06 13:08, Akshat Kakkar wrote:
> I am having ipset 6.32
> 
> The hash type is hash:ip
> 
> I am adding/deleting IP addresses to it dynamically using scripts.
> 
> However, it has been observed that at times few IPs (3-4 out of 4000)
> are not found in the set though it was added. Also, logs show there
> was not request for deletion of that IP from IPSet.
> 
> Is it a bug?

I think you should try to make script to create at least reproducible 
scenario
And sure post more info about your setup (kernel version, vanilla or 
distro)