Hi there! I understand you're having some trouble with pins and elevation (height above sea level) data in the OS Maps app. I'd love to help you sort this out.

To get started, could you tell me a little more about the specific problems you're facing? For example:
- Are the pins not showing up at all, or are they misplaced?
- Is the elevation data missing, incorrect, or inconsistent on your routes or pins?
- Are you seeing this issue only in certain areas, or everywhere you use the app?
- Are you using OS Maps on a mobile device or via the web on your Windows 10 PC with WebKit browser?

These details will help me guide you through the right troubleshooting steps. Meanwhile, here are some general steps you might try:

1. Check App Version: Make sure your OS Maps app or web interface is up to date. Older versions can sometimes have bugs affecting pins and elevation data.

2. Internet Connection: Elevation data and pins often require data downloads. Ensure your internet connection is stable.

3. Recalculate or Refresh: Try closing and reopening the app or refreshing the page. If you have a route plotted, recalculate the route elevation or re-add the pins.

4. Clear Cache: If using the app, go into settings and clear cache or app data (this won't delete your saved maps but might fix display glitches).

5. Check Elevation Source: Sometimes elevation data is derived from digital elevation models with limited resolution, especially near steep terrain, so minor inaccuracies may occur.

If you’ve already tried any of these or want me to help with more detailed steps (like location permissions, data syncing, or checking elevation settings), let me know! Your device details help me tailor the advice, so thanks for sharing.

Are you experiencing this on a particular route or across all maps? That info will help next!