Error: You can't post twice in a row!

When trying to post in my Group Forum.

EDIT: I wasn't the one that posted last, I double checked. https://subeta.net/forums.php/read/865117/LairBear-Corner-Booth-v3/164

RE-Edit: Well... guess there was a delay in my other post and now it is seen as my last post. The site lag must have done it... anyway, it NOW shows I am last to post, so locking this one.