It's a very strange currency, every time I buy it, it goes down, and every time I sell it, it goes up.

Bitcoin is rising, Ethereum is rising, and Solana is rising too.
And during the correction, they maintain the previous levels and return to them.
Why does XRP not maintain its previous levels?

Your question reflects a very keen observation about the performance of cryptocurrencies. There are several reasons that might explain why XRP does not maintain its previous levels compared to currencies like Bitcoin, Ethereum, and Solana: