Hello @Dodotagung
Congratulations for your first post in the PayPal Help Community!
Sorry to hear about the difficulties you've encountered while registering your bank details in your PayPal account. It cold be a technical glitch that the information you've tried to enter getting disappeared. Please try clearing cache, cookies from your browser or try using a different device/browser to see if it works.
You can also find the possible reasons for the bank decline here : Why can't I link a bank account to my PayPal account? If the issue persists, please reach out to PayPal Support team to get this checked further.
Hope this information helps,
Bindu
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