A quick search didn't find these, so here we go.
Wrong weapon assigned to fire control
Individual Unit Details window, Combat Settings tab.
If an energy weapon is recharging, the charge is appended to the weapon number:
Selecting "R1.5/C3 High Power Microwave #1 (Ready To Fire)" works as expected.
Selecting "R1.5/C3 High Power Microwave #10/3 power recharged" assigns weapon #10.
There should be a space before "0/3 power recharged".
If the weapon name contains a #, the wrong weapon is assigned.
Selecting "Weapon #7 #1 (Ready To Fire)" assigns weapon #7.
It should match on the last "#" instead of the first.