Whenever I have text copied to my clipboard, this text gets auto-pasted into the field of the "Find" command (Command + F) with no interaction from me. I don't like this behavior, as most of the time that is not what I wanted to search for and then I have to go in and delete it before I can search. Even if there is already text there from a previous search, the clipboard text will replace it when I hit Command + F.
This happens to me in Firefox, Chrome, Safari, TextEdit, Sublime, Keynote, Pages, and Numbers but not in Microsoft applications like Outlook and Word. These are just the apps I've tested, I don't know about others, but I can check if that becomes relevant.
I am on OS X El Capitan (10.11.6). This occurs on both my desktop and my laptop, so it's not isolated to one computer. Both computers are running El Capitan (upgraded from Yosemite via the App Store, so no weird installers) but other than that have fairly different setups/app installations.
Does anyone know how to disable or prevent this? I found this link to someone asking a similar question about Firefox, but their solution (an extension) only applied to Firefox copying text selected in Firefox.
I don't have any utilities related to the keyboard installed or any keyboard remapping or even any custom shortcuts at all.