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You're the 3rd person who said that. I think that is the case.

yeah same happened to me 2 days ago

Later, I found on ecency the exact thread I edited. I did not exceed 240 characters. I think it's more of a glitch.

then what could have caused that.

I think not just a glitch. Just editing using another front-end will delete your thread. Yesterday, it was not like this.

then I’ll try that later and see. I’ll just edit