Grouping by day duplicates dates to next day

[slimndap]

Every once in a while, it duplicates showtimes to the following date. So for example, if we have "Gremlins" playing at 8pm and 10pm on a Friday, but not on a Saturday, at some point it will suddenly duplicate the showtimes to the following night, so that on the home page and calendar page, "Gremlins" looks like it's showing at 8pm and 10pm on both Friday AND Saturday. Then, once Friday's 10pm starts, and the 10pm screening disappears off Friday's date, it disappears on Saturday's as well. As you can well imagine, this has caused a lot of frustration with our guests over the last couple of months that this has been happening, as they assume the film is playing an additional day when it's not.

For example, here is a screenshot when this film's Monday 8pm show duplicated to Tuesday. As you can see, the duplication always comes in at the beginning of the showtimes for the next day, out of chronological order - the duplication first, then the actual start times for the films. (Unless it's not playing at all the next day, in which case it will still duplicate, but only with that showtime - so with this as an example, if Women was ONLY playing on Monday at 8pm, the Tuesday duplication would have just had it at Tuesday at 8pm - even though it's not playing on Tuesday at all.)

[slimndap]

More info on support forum: https://wordpress.org/support/topic/todays-events-are-being-duplicated-to-tomorrow/