I made 2 threads (Aug 12 2023 09:30pm and Aug 13 2023 08:13am) to sell different things in same trading forum. The uneditable is the newer thread (Aug 13 2023 08:13am). Both have exactly 5 reply.

Anyone know what the algorithm that make the opening post uneditable? Time doesn't seem to be it. Is there a link somewhere on d2jsp that tells me this?

Different subforums have different timeframes in which the first post can be edited.
You said you created both topics in the same trading forum, did you edit one of these posts?
Editing the first post basically resets the time in which the post can be edited.
If you don't have customer perks the edit time for a first post in Diablo trading forums is 3 days.
This only counts for the initial first post within a topic, all other posts in the topic can be edited for up to 30 minutes without customer perks.

Read more about customer perks here:
https://forums.d2jsp.org/verify.php

This post was edited by derAmigo on Aug 16 2023 08:24am

I see, thank you very much for the information