For loop not waiting finish one item to start another item [closed]

This is my loop setup: for ($i = $current; $i < $maximum && $i < $total; $i++) {...}

I added some error_log() inside the loop to check if all items are following the right steps order: 1. starting 2. check if exist 3. create if not exist 4. finish.

But sometimes, the log is something like this:

1. starting #2008
2. check if exist
3. starting #2008
4. check if exist
5. create if not exist
6. create if not exist
7. finish #2008
8. finish #2008

That is: it's look like the loop is running twice for the same item and create a duplicated item.

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