Hi! I understand that Mercari is working fine on your phone, but on your Windows 10 desktop using WebKit, you're not seeing any listings, purchases, or other content. Let's see how we can get this sorted out for you.

First, just to confirm, when you say "not showing," do you mean the pages load but the listings are blank, or do you get any error messages? Also, have you tried refreshing the page or clearing your browser cache?

Here’s a step-by-step approach to troubleshoot this:

1. Clear your browser cache and cookies: Sometimes old data can interfere with page loading. On your Windows computer using WebKit (likely a browser like Safari or a similar engine), go into browser settings, find the option to clear browsing data, and clear cache and cookies.

2. Check for browser updates: Make sure your browser is updated to the latest version, as older versions can have compatibility issues with websites like Mercari.

3. Disable any VPN or proxy service: If you’re using a VPN or proxy, disable it temporarily as it can affect Mercari’s server responses, especially on desktop browsers5.

4. Try a different browser: Sometimes an issue might be with the specific browser you’re using. Try accessing Mercari on a different browser (like Chrome or Firefox) on your Windows 10 machine to see if the listings show up there.

5. Check your internet connection: Ensure your connection is stable. A slow or intermittent connection might prevent data from loading properly.

6. Log out and back in: Sometimes re-authenticating your account on the desktop browser helps refresh your session and data.

Let me know if any of these steps help or if you notice any error messages during the process. We can then dig deeper if needed! Are you comfortable trying these and telling me how it goes?