The code does exactly what you wrote. Let's see ... the first iteration of the loop leaves both variables unset and nothing's printed. The second sets $correction, but the $date is empty so nothing is printed. The third resets $correction to 'Article_text2', but $date is still empty so no print either. The fourth finally sets the $date and prints and clears both variables. The fifth sets $date, but the $correction is empty and nothing is printed. And the last one doesn't do a thing.

If you want to match the first with the first, second with second ... no matter about the order in which the dates and corrections are mixed together you have to be ready to remember more dates and corrections, not just the last one. Either first loop through your array and build an array of @dates and array of @corrections and then loop through both those arrays at once and print the statements or loop through your array, push() the encountered dates and corrections into arrays and whenever both arrays have elements, shift() the first element from both and print the statement.