Photos not appearing in PC backup from iPhone after May

I want to backup my photos on my PC the old fashioned way. The problem is that when I connect my phone to my PC it only shows my photos up to May and it is currently September. The photos are in fact in the photos app on my phone. I don't understand why they don't appear on my laptop.

I'm not paying for iCloud and not planning to.

[Re-Titled by Moderator]

Original Title: Backup photos on PC