Coolant question

[seehecksdeeh]

I recently replaced my radiator and also replaced a small hose that ran coolant through it when fixing a leak. Since then I've had an issue with my coolant reserves. When I finish driving to or from work, I will notice coolant slowly dripping from the little pan below my radiator. We've already identified that there are no specific leaks, rather my coolant is coming out of my reserves. I've brought the coolant level down to the fill line once, only to have it come right back up to the top again without going down. Has anyone ever encountered this issue or have advice? I'd appreciate anything.