Why is the last script executed twice?

Question

Here is my problem. I have two files, file1.sql and file2.sql that are called in a third file test.sql. The output from test.sql show that file2.sql was called twice
--file1.sql
select 'file1' as str from dual;
--file2.sql
select 'file2' as str from dual;
--test.sql
@file1.sql
@file2.sql
The output shows:
STR
file1
STR
file2
STR
file2
Why is the last file execute twice. If I change the order of files in test.sql, then file1 is displayed twice

Answer 1

I found my problem. In test.sql I had '/' in the last line
--test.sql
@file1.sql
@file2.sql
/