Why do blank contacts keep showing up on my phone?

Phone Mfr.: LG
Model: LS665
Software: Android 5.1.1

In my Contacts list, blank contacts keep showing up. It says "no name" and when I click on it, it's a "PersonsMetadata" folder. I haven't any idea what that is. I delete them but there must be hundreds of them on there and it's very tiresome having to delete them constantly. I've searched extensively online to try to find out what this is and how it gets onto my phone, but I haven't found any information.