The 2nd and 4th panel from the left are a different way round from the 1st and 3rd, or vice versa if you prefer. Also not sure what's going on with the 2 posts close to each other, that's not very good. That said, it doesn't look too bad.
Definitely they all need to be the same way up.....you'll look at nothing else if they are left like that!
Good luck with your quest - its not really such a big deal to put things right. If the panels are nailed to the posts then they can be cut rather than prised out.....it may prevent some damage.