The inconsistency with the back button in your PHP application is likely due to how browsers cache pages; when you navigate via $_GET, the new state may not be stored correctly.
To enhance user experience, consider implementing a JavaScript-based custom back button that manipulates the history object, allowing for more predictable navigation through client selections.
Another option is to use session variables to store the previously selected state, ensuring that users can easily return to their prior selections.
Ultimately, using AJAX for seamless loading of content could also improve the user flow and eliminate reliance on the browser's back function entirely, keeping users on the same page.
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