On a 'show nat' display, what does the untranslate_hits mean as opposed to translate_hits.
Actually yes it is possible and i may have been a little imprecise in my previous answer. From the Cisco command reference for ASA
counters-translate_hits provide counters for real to mapped address conversion and untranslate_hits provide counters for mapped to real address conversion
So even though NAT is a 2 way process i'm not sure what you are seeing with the counters is the 2 way conversion. An example might help
static (inside,outside) 18.104.22.168 192.168.5.1 netmask 255.255.255.255
If the connection is initiated from the inside host 192.168.5.1 i believe you will see this as a translate_hit because it is a real to mapped IP address translation.
If the connection is initiated from the outside to the 22.214.171.124 address i believe you will see this as an untranslate_hit because this is a mapped IP to real translation.
So i don't believe that for a connection you will get both a translate_hit and an untranslate_hit, rather i think it registers as either one or the other depending on which side the connection was initiated from.
Unfortunately i don't have an ASA to test this with but it would account for the uneven counters in your output.
translate_hits = counter for real to mapped IP addresses
untranslate_hits = counter for mapped to real IP addresses
In other words NAT is a 2 way process.
real IP = 192.168.5.10
Natted IP = 126.96.36.199
translate hit is when 192.168.5.10 is changed to 188.8.131.52
untranslate hit is when 184.108.40.206 is changed back to 192.168.5.10