Sorry that Photoshop is snapping your image to a very high zoom level while you're working on it. Could you please let us know the version of Photoshop you are using? Does the problem only occurs when you're using your mouse or trackpad?
If using the latest version, please refer this discussion Photoshop CC 2018 19.1: Photoshop opening images highly zoomed in unexpectedly | Photoshop Family Customer Community and let us know if you're able to relate to it.
Thanks for the speedy reply. I am using Photoshop CC 2017.1.1 on a Mac OS El Capitan 10.11.6 with a 27" Wacom Cintiq. I do not use a mouse or trackpad.
I checked out the link you mentioned. I have never even opened Bridge, I have no idea what that is for. As the article suggested, I will try resetting my preferences.
Please check for update of your Wacom Cintiq tablet on the manufacturer's website. If there's an update available, please install it.
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I noticed you gave 2017.1.1 as your Photoshop version. The latest is 2017.1.3. It may not be the direct cause of your problem but please keep Photoshop up to date.