How Can I Fix - data validation oddity?

data validation oddity

Hi all,
I have a spreadsheet with a column b that can contain either text or a number.
It has a data validation formula in it designed to not allow the duplicate entry of any numbers, e.g., =OR(ISTEXT(B7),AND(ISNUMBER(B7),B7<>B$6:B6)).
The formula works fine.
However,
after closing the worksheet and reopening it, the formula no longer restricts the values.
If I want to "restore" the rule, I have to click the "Apply these changes to all other cells with the same stings box" every time I open the workbook.
It's not unique
to this file, since I've tried creating a new worksheet with the same rule, and it behaves the same way.
Am I doing something wrong? Shouldn't excel remember this rule?
Thanks.
Jim

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