EPCOT rarely, if ever, closes early. Unlike the Magic Kingdom, there usually is more consistency with the closing times at EPCOT.
In EPCOT, at times this happens with less popular attractions like Journey Into Imagination or some of the films.
This is quite common with the less popular attractions throughout the park. You can also check the closing times in the My Disney Experience app, and plan your last hour in the park accordingly.
We love enjoying time throughout EPCOT after dark, especially when easing our way around one of the festivals and having a snack and possibly a cocktail!