Hello,
Not sure why this happened.
First, try deactivating and reactivating the plugin. This should fix the capabilities.
If not:
Recurring airdrops are implemented as custom post types. The type slug is wallets_airdrop.
You can use any capability-editing plugin to assign the following caps to your user. A good plugin is User Role Editor.
publish_airdrops
edit_airdrops
delete_airdrops
edit_airdrop
delete_airdrop
read_airdrop
Your admin user should also have the manage_wallets capability. If you see the Wallets menu then you already have it.
Hope this helps. Please let me know if it doesn’t.