Website Bug Fixes Needed

I’m looking for an experienced web developer to hunt down and resolve a collection of bugs that have started to affect my site’s day-to-day performance.

Here’s bugs for the site:
Technical Bug
Current Functional Issues (Bugs):
• categories list disorder
Checkout Failure: Clicking "Proceed to Checkout" results in a "Server Just Snapped" error. The server is failing to process the request (likely a 500 Internal Server Error).
• Profile Access: Links to "My Profile", "My Wishlist", and "My Addresses" are unresponsive or failing to load user data correctly.
2. Improvement Request (UI/UX Enhancement):
• Address Selection: Currently, users have to type address details manually. We recommend implementing a Dropdown Menu / Autocomplete feature for the Country, Governorate, and City fields.
• Benefit: This will ensure data consistency, reduce typos, and make the checkout process faster and more reliable for the customer.

Stack specifics: Familiarity with PHP, MySQL, css3.

I’d like the first round of fixes turned around quickly, followed by a short verification window where we confirm everything is solid in production. If you’re confident at triaging live-site issues and can communicate clearly as you work, I’m ready to get started.