DNS host/device name messed in IP

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I see one DNS situation and hope someone can shed some lights here:

device22 is a printer, host55 is a Windows XP laptop. device22 is DHCP
assign IP and register dynamically in DNS, same as host55.

c> Ping device22
Pinging device22[172.16.10.22] with 32 bytes of data:

Reply from 172.16.10.22: bytes=32, time=1ms, ttl=253

c> ping -a 172.16.10.22
pinging host55.mydomain.com [172.16.10.22] with 32 bytes of data:

Reply from 172.16.10.22: bytes=32 time<1ms TTL=253

c> ping host55

Pinging host55.mydomain.com [172.16.10.55] with 32 bytes of data:

Reply from 172.16.10.55: bytes=32, time=1ms, ttl=127

c> ping -a 172.16.10.55

Pinging host55.mydomain.com [172.16.10.55] with 32 bytes of data:

Reply from 172.16.10.55: bytes=32, time=1ms, ttl=127

You can tell, that somehow the IP for device22 and host55 are messed
together.

What is causing this issue and how can it be resolved?

thanks,
fshguo.

.