mySQL dump issue

[apc c]

Hello,

I have a very strange issue with MySQL/mysqldump.

A msqldump database dump suddenly increased in size from 16 MB to 479 MB.

I restored the original 16 MB database, dumped it again, and again the dump size was 479 MB.

I browsed the database in phpMyAdmin and the table and total database sizes ae as expected.

Then I opened and browsed the dump file and discovered that it also included the data of another, much larger database located on the server and that the total of the two databases was indeed the 479 MB.

I used the command line to check the size of the database and it listed at 479 MB instead of the correct size, again reflecting the size of both databases.

Question - how can 2 totally separate databases become linked in this way and what can I do to fix it?

Thanks very much.