The issue is noticed when anime has either specials (which may have numbers that the regex catches, thus leading to two Episode 1s), or when their are seasons (for example, Avatar - which has 3 'books' leading to duplicate episodes, and makes episode selection behave weird)
The issue is noticed when anime has either specials (which may have numbers that the regex catches, thus leading to two Episode 1s), or when their are seasons (for example, Avatar - which has 3 'books' leading to duplicate episodes, and makes episode selection behave weird)