I think some readers tend to forget that all of these books are technically Harry's Journals. He wrote them. So therefore there are going to be issues like this, especially someone who is impacted by this much trauma.
Additionally, it feeds into an ongoing theory that Harry is not a reliable narrator. This is something that pops up every now and again.
I also feel like the books are getting closer to (Harry's) present time. The early books often read like they are furtner in the past, while as we creep close the end, they feel more "current".
Just one mans opinion.