I’m seconding this issue. I’m using the “Tribe Event Styles” too and it won’t change in the customizer.
I had to add the custom CSS to my final call CSS:
/* fix buttons on calendar... doesn't like theme customization */
.tribe-common .tribe-common-c-btn, .tribe-common a.tribe-common-c-btn {
background-color: #d66f45;
}
/* Fix color of current date in event calendar */
.tribe-events .tribe-events-calendar-month__day--current .tribe-events-calendar-month__day-date {
color: #d66f45;
}