bperwerton

I filled a claim in April of 2016 and just last week i got in for my exam. Soon after that it went from gathering evidence to preparation for decision and just yesterday went to pending decsion approval. I checked on it today thru e-ben and it was sent back to preparation for decision? I have heard of it going back to gathering of evidence but why would it go back to prep for decision? Should i be worried or what? Thanks