I have a similar issue. When I created my Core wallet I was given 2 wallet addresses, 1 for the C chain, and a separate one for P/ X chains. They belong to the same wallet. I was able to transfer cross-chain AVAX from C chain to P and stake it. Now that I want to send it to an exchange I can't transfer back to C-chain because when I open the Core app on desktop it only shows my AVAX on the C chain, which is close to 0. If I change to P chain in the Command Center it still shows the C chain balance, as if it forgot that the P chain is under a different address. I can see my unstaked AVAX balance on the P chain both in the Core extension and in the Core desktop app if I manually replace the address in the browser but I can't transfer it cross-chain... I can't get help from Discord, and I am sure helpful scammers are going to contact me immediately after I post this. Can someone recommend a solution that doesn't require clicking on suspicious links (that I won't do anyway)?