Lost ankihub changes to download from anki web

You need to click “upload to ankiweb”

Clicking download from ankiweb deleted those cards for you

Please do the following:

Please try resetting your local changes. To do this:

Go to browse in your Anki → at the top click on ankihub addon tab → press reset all local changes

This will restore everything to what AnkiHub has unless you have specifically protected those fields

Then click upload to ankiweb

See this for more info: Should I click upload to ankiweb or download from ankiweb?