How come you can't edit some of your steemit posts?

edy(35)
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How come you can't edit some of your posts?  

I wish to update one of them and the edit button has vanished!

https://steemit.com/cryptocurrency/@edy/ethereum-on-another-bull-run-post-hard-fork

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How come you can't edit some of your steemit posts? | Ecency