tried importing pankow deck via desktop but instead it deleted all other existing decks and just showed up. still havent synced my ipad so my other existing decks are still there but my phone and ankiweb just show the pankow deck
First, let’s get your collection back where it was.
If your devices were all in sync before that import, on your iPad, you can force a one-way sync – 
Preferences > Syncing > One-Way Sync – and upload to AnkiWeb. Then on each of your other devices, you can sync to receive that and download from AnkiWeb.
If your devices weren’t in sync before that import, on your desktop you can restore an automatic backup made before that import – Restoring an Automatic Backup (Recovering from Data Loss) - Anki FAQs . I suspect there was one made immediately before the import.
Now, about that deck – where did you download the deck from? Is it a COLPKG file instead of an APKG file? If so, you clicked past a warning that importing it was going to replace your collection. In the future, make sure you read those messages, and you’ll avoid this!
You should let whoever posted/shared it know that they’ve posted the wrong sort of file for sharing. Maybe they can fix that before anyone else has to deal with this. Exporting - Anki Manual
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