When a number of SQL queries are issued one after the other in the SQL tab, nth query is run n number of times.
How to reproduce (my case):
1. Select a database
2. Type "CREATE TABLE `test_1` (`field_1` varchar(1) NOT NULL)" in the SQL textarea
3. Press 'Go' button
4. Edit the statement to change only the table name (test_1 to test_2)
5. Press 'Go' button
6. Press 'Go button again (do not edit the statement)
7. There will be 3 'table_2 already exists' error instead of just 1.