I suspect that it has to do with "linking". When the TBolt gives you those numbers that appear the same, names, etc. from all your accounts (Gmail, Facebook, LinkedIn, etc.) and asks you to link, I suspect something goes wrong there. Try unlinking some of those accounts and see if that helps to restore your ringtones to normal. Good luck.
All my contacts are in GMail, which is probably true for most Android Users. I disabled the Verizon Backup Assistant. I do have Facebook but actually none of the contacts in question are linked. (My kids won't "friend" me in Facebook, and my wife, and house don't have Facebook accounts). The default ringtone doesn't have a link either. So there is nothing to unlink.
The problem did start after the last few Android updates. When it started exactly I don't know.
I know if I call Verizon they will tell me to wipe out my address book and then let it resync with Gmail. At that point reassign all my ringtones. That is their answer to everything: Start over.
Thanks,
JedK