When I choose the spider origin, it wont work for me. everything about the origin is fine except for the ability to climb.

Same here. For what I can see any origin with the ability to climb or other actions specified by the condition type: "origins:block_collision" just does not work in any way possible.

same i cant climb sometimes but sometimes i can

Please first check if your climbing power is active. If it isn't (the power doesn't work), you can press the Primary Active key (default: G) to re-enable it.

There's no indicator for when it isn't active on the Fabric end apart from checking unfortunately, and that's not really something for us to fix.