Can you hear the system going over relief (and maybe the engine lug down depending on its power) when it hits the end of the stroke or does just come to then end then stop and sit there like nothing unusual was happening? Can the cylinder be manually pushed back in with the lever in any position? You mention this is a home-built splitter - did you just get it together or has it been working fine until now? Did the problem appear all of a sudden or gradually over time. (Sorry for all the questions here! Just trying to help nail down exactly what is happening.)
I agree with Jim and also have suspicions that something in the valve isn't right. Obviously you're somehow getting oil out of the neutral "loop back" gallery into the port to the base end of the cylinder. And, at the same time it would have to be allowing oil from the rod side to find a way out. A worn spool and/or bore could potentially cause this. Equal pressure applied to both sides of the cylinder will cause it to extend due to the larger piston area on the base side and if the valve was leaky enough would also allow oil to escape from the rod side back to tank. The spool should have an extremely close fit in the bore - any amount of "wiggle" means there is a problem.
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