Deductions & credits

I have done as indicated, but this items keeps coming up for review.  It states the following

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1040/104SR Wks: Cash Charitable is too large.

Cash Charitable 300.

Line 10b has 300.  

I am filing with a status of marrried joint return.

 

Why does this item keep coming up for review?  It isn't going to let me file electronically if this isn't fixed.  Is there a flaw in the program?