enchantment

I'm just reporting this because it feels a bit weird, considering that it doesn't look that galaxy souls make use of randomness for anything. I forged my galaxy sword to a infinity sword, using 3 galaxy souls. Next day I was planning to try enchanting my tools, so I proceeded to this website to...

I can only seem to get the powerful and the swift enchantment on my axe and it always switches back and forth between them when I re-enchant it. I'm trying to get the shaving enchantment. Is anyone else having this issue or is my luck that bad?