It is because of the BTC pump. Also, I see some of the users can not enter their addresses in the Arkham dashboard. This is a major bug the team needs to fix. Also, the Arkham project team only gives ARKM tokens to the referral users. But the Arkham dashboard has more functionalities compared to the debank dapp.
The dashboard UI of this website is still lacking, even though the functionality is sufficient. And as you say, there is some bug that i have experienced by myself. when I try to track my wallet, I find bug on portfolio feature, The bug is, I find several tokens that I no longer hold but still appear on the list. After I checked again through the official explorer, the token was not in my wallet. I try to send this issue to Arkham support via email, I don't know i will get response or not.