It possible you have air in the cylinder. The hydraulics will compress the air to lift the bed. Then when you let it down that air will escape violently blowing oil out of the tank even though you did not have too much oil in it. Then when you try to lift again, you will suck some air/oil as the level gets low. Then you add oil and push more air from the system into the cylinder. Then you add a little more oil to the tank, and the same thing happen when you lower it again.
Lift the bed 1/2 way and lower it a few times to be sure you have cleared all the air. Then raise it 1/2 way, add some oil, til you get it all the way up. Then let it down slow, see if that works.
Also, be sure your tank does not have a big dent in it that would decrease the capacity.
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