Your Page Designer theme also flows into Event Group listing pages. When an event group contains at least one event that has a Page Designer layout, the group listing automatically adopts the default theme set on that Page Designer event: the same colors, typography, and button styles your attendees already see on the event page itself.
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Granular control over individual Event Group page elements is not supported.
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Avoid mixing Page Designer events with other event types in the same Event Group. When a group contains both Page Designer and non-Page Designer events, the Page Designer theme can leak into the styling of the non-Page Designer events. This is a known issue.

Event Group listing: theme inherited from the default Page Designer layout when Caching 2.0 is enabled