This is an important update that should be installed for those using versions 1.14+
This update is simply a bug fix. Thank you to those that have reported it. I wish I had resolved it sooner however I am and have been for the past couple of weeks away from the states so it has been hard for me to work on the plugin.
Also, I wanted to warn everyone that I am aware now of a visual bug where limiting the maximum cost doesn't have a visual effect on the anvil, but in execution the level cost deducted is as expected. For example, utilizing the permission, maxrepaircost.limit.100, will deduct a maximum of 100 levels, however the anvil will still show that the cost is higher than that. For now, have your players ignore it, I will try to work on a fix once I find the time again.