Whenever I try watching a replay to submit a run, it never shows the run, it always shows one singular I piece with more on the side. Does anyone else get this or am I the only one?
Could you link a specific replay that isn't working for you? And do you have any scripts running as you play? There has been rumors that real block can mess with the replay system.
Or maybe try to uncheck the WebGL setting on the + tab in your game settings
Try doing what Sausty mentioned, and check if your runs still can't be replayed after that. Also: are you using any additional scripts or plugins during your game? They may have a great impact on this situation.
Here is a preliminary draft of a new global leaderboard rule:
Every submitted run has to be tied to a Jstris account. This account either has to be named similarly to the one on speedrun.com or have the speedrun.com name be permanently displayed in the "About player" section of the Jstris account.