Item Drops Far From Block Being Broken

I have been playing on a survival world in 14w08a. When I try to chop down a tree, I find that I am missing some logs. I look around, and the ones that I am missing are scattered all over the place. I have also noticed this while mining with the cobblestone, diorite, andesite, granite, and ores. No screenshots because I am not sure how to show what is happening.