Repair Two-Page WordPress Site

I updated WordPress and several plugins on my very small, two-page site and the result wasn’t pretty—sections shifted out of place and a few interactive elements stopped working altogether. I’m on a specific premium theme that’s already at its latest release, so the trouble points are almost certainly plugin conflicts or styling overrides left behind after the updates.

Here’s what I need from you:
• Identify the exact conflict(s) causing the layout problems and broken functionality on both pages.
• Correct the CSS/JS/PHP so the pages render exactly as they did before, with no console errors and full responsiveness on mobile and desktop.
• Keep all changes inside a child theme or custom plugin so future WordPress or theme updates don’t break the fix.
• Leave clear, concise notes on what was changed and why, so I can maintain the site going forward.

The job is complete once both pages load quickly, look right on all common browsers, and every button, link, and form behaves as expected.