This happens occasionally with some people. It has happened to me but only very rarely.

But are you 'sure' it's your own files & not simply spam results in the search results suggesting you already have the file?

If you did a browse & it showed your ip address then yes that suggests the first scenario.
Likewise with mindping, are you sure you are properly connected with the network?

I found it happened to me when LW was unable to find other results. But no idea why it was happening. Which version of LW are you using? Check that LW is not suggesting you are firewalled. You can see option as a brick wall or blue world icon at bottom left of screen for LW 4. Or for LW 5, Tools menu, Advanced, & top left you will see if it says you are firewalled.

I have LW 4.18.8, and it does show a brick wall (firewall). But I have my firewall set to allow LW access. Maybe it's not working the way I expected. Is there something different I should try?

I did a browse, and it did show my IP address, so I was "finding myself". I still do find my own files, but less often because I'm sharing fewer files now.

Thanks for your help!