Results take much longer than execution time to appear

I have been making submissions to the 2022 Habitat Challenge but have been noticing that EvalAI does not update with “Finished”/“Failed” until much later than the Execution Time implies. It seems to be over 24 hours late in some cases. Any reason for this?

Additionally, whenever I open the submissions tab on the webpage, many red error bubbles appear with an exclamation symbol but no text. Is this supposed to mean something?