Mine did the same thing. I ended up getting #6 ORB to 3/8" BSPT adapters from discount hydraulics. They were both #6 male, one was 3/8" BSPT female, the other 3/8" BSPT male. Also a pack of the O-rings that fit the #6.
The hoses mounted directly to the fittings, the ORB type sealed first try onto the cylinder. I think the total cost including shipping was around $25.
No matter what I tried with the fittings that came with the cylinder, they still leaked. I tried a couple of thicker sealing washers and it still leaked.
If you need the part numbers for the adapters, let me know and I can dig them up.
Not sure which hoses you got or which fittings are on them.... I got mine as a set from Agri-Store.