If mid jack and rear on same side are creeping down it can only be caused by one of two issues.
The mid/rear levelers operate in tandem on each side. Each side is separate from each other
Either 1 if the mid/rear levelers is bypassing internally or the solenoid valve for that respective valve is not closed all the way
There is a manual port screw on the solenoid used for manual operation that may not be fully tight. This can also let the solenoid bypass fluid.
Use 1/8 inch Allen wrench and lightly snug it
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