Can't save one of my tabs to the cloud

I reloaded a tab that I had recently edited and saved, only to find that the changes were gone. I tried making them again and saving, but found that they wouldn’t take when saving to the cloud (saving to disk worked fine). Tried it with another tab and didn’t have a problem. Thought maybe if I deleted the problem tab on the cloud, reloaded it from disk, and then saved it to the cloud again the problem might go away, but this time when I tried to save it to the cloud I got an error:

“Sif is too long (maximum is 3000 characters). Sin E is too long (maximum is 3000 characters).”

Looks like the file got corrupted somehow, as I started over and recreated the same sequence in a new file and this time it saved properly to the cloud.