Efficiency 6 Pick lost to accidently combining with a efficiency 5 pick

Hello, your statement kinda answers your question- “a pic can loose its efficiency when combined with another of lower value”. now, there are some ways people get by and that’s really just being careful and cognizant of what they’re combining. I am able to combine sharp6 with other enchants like sweeping of edge (on survival), I have yet to test the higher/custom enchants on skyblock and on pickaxes in prison; however, i have been able to merge the fire aspect3 with my own swords on prison (using some the tips i’ll layout for you below) This is not really a problem with the server, but moreso how vanilla minecraft is, so not a lot can be “looked at” and such.
unfortunately the server cannot refund you your keys or pickaxe(s) since this wasn’t really a bug. some tips i’d prolly give out to prevent this from happening is to:
1. put the higher eff in first slot of an anvil
2. check/hover over the result to make sure it’s what you want before hitting shift left click or whatever you press to receive an item from the anvil
3. you can always test it in single player. there’s lots of resources/videos out there on how to get custom enchants in vanilla minecraft using commands. this one is a little of a hassle but to be a little more sure before using irl money and hard grinded items.

sorry about your pickaxes, and if i missed any details or something please call them out and correct me. hope this explained some things though (:

 

Hey
Sad to hear that but I have done something similar last season and messed up my mythical sword too, this is mostly due to eff 6 is a custom enchant (Not vanilla) and when it combines with any vanilla enchant of the same type it turns back to its vanilla form.

For example
Sharp 6 combined with any of the sharpness enchantment (1 to 6) will result in resetting the sword's custom enchantment into a normal enchant

From my experience there is nothing they can really do for you and sadly you cannot roll back your pickaxe (from my knowledge).
Hope this explains your question