The staking process seems a bit strange to me. I made a transfer to my wallet, which is encrypted and unlocked.
Here are the results:
3 separate "mining rewards" from staking, the same day. 10 days after the transaction, and nothing since then.

Is this normal?
It's normal. It was really easy to stake when there were no one to stake it. Now hundreds of wallets competing each other to find new blocks. I used to stake 50 - 100 coins each day. Now I'm barely staking 5 coins everyday. Sometimes I couldn't stake for two weeks.