Why do I have two different deposit addresses in my Wallet?

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From Kaspa wiki:

It's for increased security of your privacy, so no one could link your different payments (sent or received) to a single entity, i.e. you. It is also changed because once you have used an address to send or receive funds, it is considered to be weakened cryptographically by 2/3rds, so this is a standard practice for UTXO-based chains like Bitcoin, to which Kaspa belongs as well. The KDX changes the address every time it detects it is used, but it doesn't invalidate these addresses, they keep being absolutely functional, specifically you can continue mining to the same address as before, regardless of what KDX currently shows you.

This is also true for the web wallet: KDX and web wallets share the same codebase in many aspects.