I was attempting to enchant a fishing rod, diamond pick, books, etc
This IS occurring with pickaxes and other items not just fishing rods.

With adequate levels, lapis lazuli, and unenchanted item/tool the table would only give two possible enchantments. (e.g. unbreaking 1 and efficiency 1). On enchanting with one of these enchants 2 available enchants, the table would switch which enchant rows displayed

i.e Table pre enchant (effeciency 1, blank, unbreaking 1) --> table post enchant (unbreak 1, unbreaking 1, blank)

An alternative bug was that the enchantment would display but when hovering the mouse cusor over the option it would not display an enchant. The enchant option would also function and on one occasion I had all three enchant options display with no name or ability to use them.