Objects on base layer disappear

Hello Everyone,

My slide has text, shapes and a background image on the base layer. When I trigger another layer the text and shapes disappear leaving the background image. 

I've tried:
1) Checking and unchecking the lock visibility icon on all layers
2) Removing animation on objects that disapear
3) Making all objects on base layer visible the entire length of the timeline
4) Making sure the base layer visibility option for each layer is set to on

To be clear, only some of the base layer objects disappear, not all of them.

Any ideas?

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