This is a real mystery to me.
I just spent quite a while uploading geocaches to my Garmin eTrex 20, then after disconnecting it and turning it on, I deleted the track and trip records. I then turned it off and reattached it to my laptop to add a few more caches. When I then turned it back on again, none of the older uploaded caches were visible or findable on the screen, just the new ones, despite the GPX files still being on the GPS. This has happened once or twice before now as well since I had to switch to Internet Explorer after Firefox stopped working for Garmin a couple of months back. I don't know what exactly is causing it to stop showing the geocaches it has loaded into it!
I've ignored it in the months till now as I mostly hunt for geocaches using my phone but I'm currently abroad so this is a real pain in the backside!
I don't understand what's happening here; can anyone help?