Bind slave records are unreadable

Bind slave records are unreadable

I noticed that a month or two ago that my bind records for the slave
server became unreadable. The consequence of having an unreadable record
is that it appears as though Webmin cannot read the record. I used to be
able to go into Webmin on the slave machine to validate that the record
was updated there, I can no longer do that.
It appears to still be a valid record because I can query the server
itself and it returns the same data (NSLOOKUP, etc). So it appears as
though Bind can read the file fine.
I would like this resolved, but I'm not sure where to look. Any thoughts?
Here is are the the master and slave records:
===MASTER===
BIND version 9.8.4
Debian Linux 7
$ttl 38400
servertest.com. IN SOA testdns.com. foobar.testdns.com. (
1377180224
7200
3600
1209600
38400 )
servertest.com. IN NS ns1.testdns.com.
servertest.com. IN NS ns2.testdns.com.
===SLAVE===
BIND version 9.9.2
Ubuntu Linux 13.04
^@^@^@^B^@^@^@^AR^V^Z_^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@[^@^A^@^F^@^@^@^@~
V^@^@^@^@^A^@^P
servertest^Ccom^@^@5^Gtestdns^Ccom^@^Ffoobar^Gtestdns^Ccom^@R^V^Z@^@^@
^\ ^@^@^N^P^@^Ru^@^@^@~V^@^@^@^@J^@^A^@^B^@^@^@^@~V^@^@^@^@^B^@^P
servertest^Ccom^@^@^Q^Cns1^Gtestdns^Ccom^@^@^Q^Cns2^Gtestdns^Ccom^@
All the details are there, but the slave is unreadable. (copy and pasted
from PuTTy