I tried to reply to "what OS is this" in Computers and Technology and I got this response from the fakku server:
Deprecated: Function split() is deprecated in /usr/home/fakkune/public_html/includes/functions_post.php on line 80
Warning: Cannot modify header information - headers already sent by (output started at /usr/home/fakkune/public_html/includes/functions_post.php:80) in /usr/home/fakkune/public_html/posting.php on line 817
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I pressed back in the browser and tried to press send again, where after I was presented with the edit button instead. Trying to press the edit button resulted in the exact same error as in the spoiler.
After that I navigated back to the thread and my post was there, so at some point my post was submitted correctly.