MOE0807 , we know it is important for you to review your usage history. However, with text message detail, you will see the message usage posted individually even when responding to a group message.
Check out your Message usage by signing into your My Verizon Account https://nbillpay.verizonwireless.com/myv/myusage/ .
MOE0807 , that's odd. Let's figure out what is happening. What type of device you using? Are you using a different messaging application?
Keep me posted.