last command - strange entries?

[Saurabh Bhasin]

Greetings,

I am seeing strange entries when i perform "last -20" for example.
Here's a sample output becuase I can not seem to make any sense out of
this in the last two days and can't find any information online. Any
help is appreciated.

0                F=°Bttyp                  Wed Dec 31 16:00   still logged in
0                6Û¯Bttyp                  Wed Dec 31 16:00   still logged in
0                mÚ¯Bttyp                  Wed Dec 31 16:00   still logged in
7                mÚ¯Bttyv                  Wed Dec 31 16:00   still logged in
0                ¯Bttyp                  Wed Dec 31 16:00   still logged in
0                (o¯Bttyp                  Wed Dec 31 16:00   still logged in
2                ëg¯Bttyp                  Wed Dec 31 16:00   still logged in
.

and it keeps going for 20 lines. 

Thanks for your time,
Saurabh