If you delete it you loose your settings (if you were logged out it will reset to defaults then) so you need to enable the item listing at the TTC settings menu ingame again!
If you were logged in it will be rebuild from ingame saved settings at the moment you did the reloadui (settings that were active ingame at that time, before the reloadui will be taken).
I somehow got weird behavor with TTC client myself. It lists all kind of very old item listings for me in the client as I start the client (ESO game not started yet).
I sold / listed these items months ago!
But somehow it collects that info now...
I guess we should report that at the addon comments:
https://www.esoui.com/downloads/info....html#comments
Other reported issues there too already.