Unexplained query results on int keys

[Paul Plesman]

I have come across a situation where keys defined as "int unsigned" show up with odd values in query results but still resolve. See statement below.
Has anyone seen this before? The indent before the number 8 actually shows up this way. What happened to the number? I have truncated the table and reloaded with proper data and used isamcheck -r. Both to no avail.
Explanations welcome.

mysql> select * from supanswer where id=38888;
+-------+--------------+------------+--------+
| id | number | questionid | answer |
+-------+--------------+------------+--------+
|8 | 100-047-9630 | 10 | 1
+-------+--------------+------------+--------+
1 row in set (0.00 sec)