I have tested this on a sample project and I could not reproduce your issue. Note that when you click "Revert" all of the files that will be reverted are listed and furthermore it is stated in the window that "this operation discards all local changes to the files". This means that the changes will be reverted to your latest commit. Your latest commit might not be pushed to the repository. In other words, the "Revert" button reverts all local unstaged changes. It is only local and it cannot make changes to your repository.
Clicking the "Revert" button from the main toolbar will result in reverting all changes in all files. As I said before, all files that will be reverted are displayed before their changes are reverted. If you want to revert only singular files, you should right click on the file and select Version Control -> Revert on them.
That being said, we want to investigate what caused the behavior you are describing. If you could provide the name of the app project you are developing in the Telerik Platform, we can investigate this and provide an explanation of what exactly happened.
I am looking forward to your reply.