blocks not dropping when mined

Ok so this has been happening at least since the 2nd to last title update. I noticed it a few times while mining cobblestone and often when killing animals. The block or item drop would fly away ten or twenty feet in random directions for no reason and I would have to find it instead of dropping at my feet as expected. This just happened with a gold block and in this instance and some of the stone I had been mining the block was just gone as if it just didn't drop after mining it. I had been seeing some of the mined blocks looking as if they had glitched into the wall with that shadowed look. Please fix this!

Thanks for your consideration,
Bryan