Thanks @yaustar, I hadn’t even considered layers. Wasn’t too familiar with the feature at all.
I had to move the Titles from UI to the World layer AND create a new Graphics layer where I put the splines. I also added both Opaque and Transparent option to Render order chapter in Settings. Does that make sense?
However, it seems to work without adding the graphics layer transparent + opaque to the Render order at all, also.