The Cymru Expert creates a Key from an IP-Address in the following manner:
IP to Int
Int to bin
f.e.:
8.39.215.10 => 136828682 => '0b1000001001111101011100001010'

When the first octet is smaller than 128 (ipv4), the resulting binary is < 32 Chars.
For the Key Calculation in the Cache you strip the IP address to 24 Chards (in ipv4), this leads to wrong information in the cache.

The upper IP leads to a key: 100110010110110101111100

When you check the same algorithm for 130.125.112.0 you will end up with the same key.
[130.125.112.0 => 2189258752 => '0b10000010011111010111000000000000']

This will lead to wrong information when the Cache is hit.

Suggestion:
(Line 55, intelmq/bots/experts/cymru_whois/expert.py)
cache_key = bin(ip_integer)[2: minimum + 2]

        ip_bin = bin(ip_integer)[2:]
        if(ip_version == '4' and len(ip_bin) < 32) # check if lenght is smaller than 32, so shorten minimum
            minimum = minimum - (32 - len(ip_bin))
        cache_key = ip_bin[0:minimum]

But maybe you have a better Idea.

This will lead, that the Key is shorter than 24 Characters if the first octet of the ip is smaller than 128.