That is because you concatenate values to the previous subject each pass through the loop.
Change you loop to this.
--@emailSubject = @emailSubject + @sku
EXEC msdb.dbo.sp_send_dbmail
@importance = 'High',
@recipients= @email ,
@subject = @emailSubject + @sku
The subject portion stays the same 'Warning stock is below safety for : ', all you need is to add the sku to this.
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