Tattooz:
You say you're not new, so maybe you already know some of this. It's too late now, but you should always move your hydraulic control lever back and forth and forward and back before you disconnect any implement to relieve the pressure in the implement hoses (This might be your problem). You should do this before connecting as well.
You need to use extreme caution when handling these connectors, because the hyraulic fluid may be under extreme pressure and when discharged from the couplings can penetrate or cut your skin.
Try moving your control lever through all positions to equalize the pressure on the tractor. I have had success with pushing the male end of the QD against the tractor frame or something hard so the pin in the center is depressed. Hydraulic fluid WILL spray out, so don't get your hands in a position where the fluid (even if deflected) can hit you, and wear safety glasses.
Please be careful. In fact, before you do anything, wait for some other responses to see if anyone has better or safer advice on how to proceed.
BTW, I assume that you do know that you need to pull the collars back on the QD's in order to plug the hoses in.