Make sure that the composition is selected in the Project panel
Select the layer that is giving you problems
Press the "u" key twice to show us all of the modified properties on the layer
If nothing shows up press the "e" key to show us all the effects you have added to the layer that still have the default settings
Take a screenshot of the entire UI and embed it in the forum so we can see it using the Toolbar at the top of the reply field on this forum
Explain your workflow and the desired goals that you have for the layer
The rendering order follows the stacking order in the timeline - always
Effects - in order
Some effects that generate things like CC Particle World ignore masks but everything else would not. The only exception to the rule happens when you pre-compose a layer and turn on Collapse Transformations. This changed the rendering order.
If you have a motion path that you have created using the Layer/Transform/Position property and you want to scale the motion path add a Null to the comp, parent the layer with the motion path to the null, then scale the null.