[Appointments+] Base time set at 75 minutes, not 15

Although I have both “Time Base” and “Admin side time base” set to 15 to display available time in 15 minute increments, it is only showing in 75 minute increments both on calendar displayed for users and in admin. Also, on the admin side, it is showing military time. I had once set an “Additional time base” to 75 minutes, even removing that doesn’t change the time base.