Can anyone help me?

Hi everyone, recently I was playing Skyrim and I noticed something strange when I opened my inventory. All of my weapons lost some damage (except daggers and bows). Also, the dagger Keening dissappeared from my inventory. Chillrend went from doing 91 damage to 68, my Daedric Sword went from doing 99 to 74, and the Ebony Blade went from doing 29 to 22. Any suggestions as to why this happened and how I can fix it? And btw, my armor was left untouched.