It's likely two different posts, the latter has an derived identifier from the post itself while the first one has a custom identifier (which should be d-tag in the event). Some clients posts to Relays that doesn't implement NIP-33 and that can cause some issues.
This is habla: https://habla.news/a/naddr1qq9rzd3h8y6nqwf5xyuqygzxljlrqe027xh8sy2xtyjwfzfrxcll8afxh4hh847psjckhkxwf5psgqqqw4rsty50fx
This is NostrBounty:
Look at the naddr1 in the url. I think Habla is addressing it correctly and NostrBounty is either wrong or has a new post, with a new id, for it. But I cannot find this new post anywhere.
Discussion
No, it's just a bug in the code: https://github.com/diamsa/nostrbounties/issues/2