multiple calendar view not showing all calendars for past events

Hello,

We have a calendar with multiple calendars (founder’s studio, loft studio, and north studio) and for current day and future days the calendar shows ALL calendars, but for past days it only shows the loft calendar. This is also true for list view (https://www.cabiri.org/calendar/arcadia-group-calendar-list-view/)

You can see that there ARE events in the past with this calendar here in this embed I put up: https://www.cabiri.org/calendar-i-frame-test-5-15-2018/

WP, theme, and Simple Calendar are updated. Note that we are open to purchasing a pro version if there is a guarantee that past events will show, as I know they use a different feed.

The page I need help with: [log in to see the link]