Yes this happened to me a few weeks after i bought my brand new rhino.
I had a faulty water pump and the antifreeze was leaking by the seal and out the little hose. It mostly leaked when it was running and not when it was sitting.
Mine was covered by warranty so i don't know what it would of cost to fix.
You do need to fix it though cause it will get worse.
Mine Leaked out of the hose a few weeks after I bought mine. Turned out to be the water pump. It would leak when running but not when it was sitting. Warranty covered mine. I would get it fix as soon as possible cause it will just get worse and could leave you stranded.