BV Triple-A here
No problem. It's a known 8kun issue. Happens w/ very large threads. Yours is 5.5 MB (5:5 kek) of JSON data. Most regular threads are less than 1 MB, but yours is Japanese, every character takes multiple bytes.
Some of the notable threads of mine had the same problem. I detect them on my end. Sometimes they fix themselves, when someone else posts. Sometimes they don't. It's a mess.
This also causes new posts to not appear, at least not immediately. Sometimes this also seems to be some kind of delayed mechanic of 8kun, but sometimes they don't appear.