Hi Phixle, I (as well as others) are having an issue with your server and RP2 microblocks/tree leaves with chainsaw/IC2-Scaffolding. There seems to be some very wierd occurances going on...
Redpower2 Microblocks: These blocks seem fine when placed, however, on a chunk load after you go to the nether, run far away from the chunk you placed them in, or simply relogging, they become invisible, this results in the game acknowledging they're actually the location you placed them; However, when attempting to 'walk over' or 'through' the invisible block, rubber-banding occurs.
Chainsaw (shearing) Tree Leaves: When attempting to 'shear' off branches (leaves) of trees, they allow you to break them, dropping the leaf block but immediately respawn. Now, these respawned blocks that you just broke, immediately respawn as well, and do not drop any leaf blocks, this makes it nigh impossible to use chainsaws on trees period.
IC2 Scaffolding: This normally harmless item which allows climbing up the side of the block (similar to ladders) when placed, on your server, forces a rubber band effect when attempting to scale the block. This is incredibly inconvenient for larger builds and CF designs, when attempting to use scaffolds.
At this moment, I'm not the only one having the issues, so I volunteered to be the poster on this thread to see if we can get some clarity, and hopefully a fix, for this issue. I (we) thank you in advance, and thank you for your time.
PS: I'd assume it's a conflict with some type of anti-hack plugin, regarding the rubberbanding issue(s).