I added wood to test it. I made its durability 100 and it instantly mined. Please help me

I'm going to assume that you are using the latest version of the plugin, in which I recently improved the mining system to be more consistent. 

1. Did you make sure to type /map deletable? The plugin uses its own mining system, separate from MCGalaxy, which requires the map to not be deletable.

2. Did you use /block add or did you add the block through blocks.txt manually? The commands are still in the process of being rewritten to use the new system, so manual additions are advised.

Here is a template blocks.txt file including some blocks. Please feel free to tweak to your liking.

//id;hardness;tool;defaultSpeed;woodenSpeed;stoneSpeed;ironSpeed
//type 0 = none, 1 = axe, 2 = pickaxe, 3 = sword, 4 = shovel, 5 = hoe, 6 = shears

stone;1.5;2;7.5;1.15;0.6;0.4
grass;0.6;4;0.9;0.45;0.25;0.15
dirt;0.5;4;0.75;0.4;0.2;0.15
cobblestone;2;2;10;1.5;0.75;0.5
wood;2;1;3;1.5;0.75;0.5

Please note that the new mining system is still a work in progress and all feedback is welcomed.