Interesting.... I just experienced the exact same issue. Found a small leak one day under the car. So we pumped the system up cold to 13-16 lbs and every hose had a leak of some magnitude. Tighten every clamp up and now dry. Did some research and I think the hoses loose a bit of their initial thickness and definitely their rigidity over time and multiple heat cycles.
The system will self level and the catch can will see some liquid after and
antifreeze flush. Some coolant tanks will send fluid back to engine if they have a hose inside the overflow tank that extends to the bottom of the tank.
Blas
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