Change
if(.@card0 == 0).@card0$ = " - [ ^D6C4E8" + "No Equip" + "^000000 ]:"; else .@card0$ = getitemname(.@card0);
if(.@card1 == 0).@card1$ = " - [ ^D6C4E8" + "No Equip" + "^000000 ]:"; else .@card1$ = getitemname(.@card1);
if(.@card2 == 0).@card2$ = " - [ ^D6C4E8" + "No Equip" + "^000000 ]:"; else .@card2$ = getitemname(.@card2);
if(.@card3 == 0).@card3$ = " - [ ^D6C4E8" + "No Equip" + "^000000 ]:"; else .@card3$ = getitemname(.@card3);
To
if(.@card0 == 0).@card0$ = " - [ ^D6C4E8" + "No Equip" + "^000000 ]"; else .@card0$ = getitemname(.@card0);
if(.@card1 == 0).@card1$ = " - [ ^D6C4E8" + "No Equip" + "^000000 ]"; else .@card1$ = getitemname(.@card1);
if(.@card2 == 0).@card2$ = " - [ ^D6C4E8" + "No Equip" + "^000000 ]"; else .@card2$ = getitemname(.@card2);
if(.@card3 == 0).@card3$ = " - [ ^D6C4E8" + "No Equip" + "^000000 ]"; else .@card3$ = getitemname(.@card3);
It happens because when you remove the first enchant item the selection menu becomes "- [ No Equip ]:", "Enchant1", "Enchant2", "Enchant3". The script engine reads ":" as delimiter in case of select command. Since it's there all the indexes of the select options are moved [ No Equp (1), empty string (2), card2 (3), card3 (4), card4 (5) ].