Skyblock – Huge setbacks

I’m playing skyblock on the server lately and I noticed some bugs, that hinder, or even stop the quest line:
– Nether portal ignition
– You can’t ignite the nether portal, because you can’t use flint and steel.
– Nether
– If you get to the nether with a help of an admin, your items get resetted and you can’t collect materials
– The spawn nether portal is a bad idea, because you’re supposed to get materials, such as netherrack or quartz there.
– Movement
– Sometimes if you run and jump to get somewhere, it sets you back (especially on half slabs). This is the cause of half of my death.