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Frost on the metal lining underneath door sill

I've got 3 steel french doors, 2 fixed and one opens. Underneath the inside door sill where the lead (metal lining) is bent upwards about an inch I get frost the entire lenght (9ft).

I need to fix before I extend the new laminate floor I put down.
Over the summer I repainted and caulk the outside and underneath the sill, I also replace the weather stripping. Doesn't look like it fixed the problem.

Any Ideas how to fix w/o removing the entire door section

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