Hello,
First, I recommend making sure that you are logged in to the same AnkiWeb account on both your laptop and your mobile device. If you accidentally created two different accounts, one of them might appear empty.
Please note that your AnkiHub account is different from your AnkiWeb account. Visit the two websites below to make sure you have the correct login credentials for each:
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AnkiWeb: https://ankiweb.net
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AnkiHub: https://ankihub.net/
Then, I recommend going to your laptop and restoring from a backup created before this incident occurred: How to Restore from Backup. This is the safest approach because I cannot recommend syncing differently with AnkiWeb or mobile devices without knowing the current state of your collection. While this will cause you to lose any progress made since the backup, it ensures that you keep the rest of your data. From now on, just be careful when choosing whether to upload to or download from AnkiWeb.
Let us know if you need help with anything else! 