One task always starting too early - why?

[Doug Lerner]

I have one person whose work schedule is set up to not start until  
5/1/07.

When I level the project, all her tasks correctly start after that  
date - except one keeps starting at the beginning of April.

I've tried deleting and re-creating that task, but it always starts  
at the beginning of April.

There are no task dependencies.

Any idea why this one pesky task is always showing up starting early?

Thanks,

doug