Smaller number array length than correct - JS

Question

I am using an array, where when giving a console.log The same shows 2 items inside, just below in another console.log with length it marks 1, but it is certain to have 2 items in the array.

Code:

console.log(av)
console.log(av.length)

Previously, using the function slice(), she repeated all arrays when giving a push(). Then I had to get one to use the for().

In the above example the variable is global.