Help! Oil leak in radiator hoses

[boxin]

Hello everyone.
I just discovered an oil leak in the radiator hoses. It is not a major leak, but a "transpiration". I unscrewed the hose ends (bolts number 11 in the picture) and I noticed that there is some play between the metal hose (blue), and connector to "mesh" hose (yellow). Apparently there is an oring in that union. but there seems no way to adjust anything.
Is that normal or is the cause of leak?
Is there any solution? Should I to buy new hoses?

[kevin2502000]

That doesn't have an oring there, it's like a hydraulic hose. Buy a new hose if it's seeping there. There is an o-ring on each end of the hose. It's the oil cooler hose BTW.