I was too embarassed to say anything in case it only happens to me. It has been like this since the Hardfork 18.
I'm generally not notified of my replies, and recently I have noticed that sometimes things don't appear, or they do appear, but hours or days later, instead of a chronological fashion.
Look at these times frames in my replies! Normally replies are added by date, but some appear whenever they want.
Is this just how it is now?