Are you using a wiggle() expression on your camera? If so that could explain the result. wiggle() uses a seed based on the location of the property it is applied to within the composition’s hierarchy, that is to say that a wiggle() expression on one layer or property will return a different result than a wiggle on another layer or property, and if you change the order of the layer/property or add a new layer/property it may change the seed for the returned values of wiggle().
You can see this effect if you create a new composition with 2 layers (Layer 1 and Layer 2), apply the same wiggle() code to the position properties of the layers, then switch the layer order of the two layers. Notice that the result of the position property on Layer 1 and Layer 2 have switched along with the layer order.
If you’re not using wiggle() then I apologize for the long winded response 🙂
Darby Edelen