I don't see any obvious cause for what you're describing in that log.
Does it also happen without all those third-party mods? (If so, please post the log of that)
If it doesn't, then please try to find the minimal configuration of mods which triggers the issue (ideally just RM + one third-party mod) and post the log for that.
Okay cool now I know it is a bug I will just leave the world and join again when I want to record a build or something. Thanks. I love the mod as it is though. It is really fun to use and really easy once you've done it a couple of times