iCloud photo GB and iPhone photo GB are not matching up.

If you elected to optimize photos in iCloud sync, then the size will not align as smaller versions of your photos are kept on your phone with originals in the cloud.

To see your available space in iCloud, visit iCloud.com/settings.

Kimpossible2 Said:

"My iPhone says I have 86 GB of photos and videos. iCloud says I have 176.2 GB of photos and videos. How does that make sense? I only have one device (this iPhone) connected to iCloud."

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About Storage:

This 8 GB of files are only those stored locally on your iPhone. The 176.2 GB is of what is stored in iCloud. See here: Difference Between iCloud Backups and Backups you Make Using your Computer - Apple Support

Download your iCloud Drive:

Save a Few:You might want to consider downloading what you have in iCloud Drive to an external hard drive. In doing so, all would be backed up, and then you can trash what remains in it. And, in doing that, you'll have plenty of free space. Perform my User Tip: Getting a Quick and Direct "iCloud Drive-to-External Hard Drive" Download - User Tip

Correct. If you optimize, they will be different. You can check the cloud status of your photos. Open photos. Tap library. Scroll down. The current picture and video count is shown as well as the cloud status.