It's hard to say. I assume by mast tilt cylinders you mean the ones that move the mast top forward and back. About the only thing I can think of that would make them creep forward is the weight of the forks. Try picking something up and see if the forks creep any faster. Also try picking something up and see if the forks creep down any with the weight. (I am guessing it uses a hydraulic cylinder(s) to run the forks)
Leaky piston seals in cylinders could cause the creep. Not likely both would happen to leak the same amount though. It could be a leaky valve or relief valve.
Its a process of elimination. If the other cylinders on there don't creep, then you have narrowed down where the possible leak is. Just trace the lines to where they lead to the valve and then it could be anything else downstream going back to the tank.
Can you tilt the mast backwards and let it sit? Leaky cylinder pistons would allow creep in both directions but the valve may as well.
On the valve, look for any thing that looks like a bolt head or nut on the valve body. Those could be a popoff or check ball assembly. With the engine off, remove those and check for crud under the balls. If one is looking down, be ready to catch a ball and spring in case it has that type in it. I'm just guessing here since I haven't been around a forklift in years by they probably use similar hydraulics as tractors. The orings on them aren't leaking or you would know it but be ready to put new ones on sometime.
Check the valve operation also. I assume you have a 2 way valve. Sometimes the linkage gets bent or broken or out of adjustment and the centering piston doesn't come back to the right position. You can hold it a little past where it stops to see if the creep stops. Bleed any pressure off the system before you start taking it apart.
Post back with what you find out. Pics would help.
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