If its doing all that (the explanation as to how the pump disconnects above is a good one too) replace the valve core, done it a couple of times when they got sticky with one from an old inner tube.
shock pump that does not lose air when you unscrew
I have a Magura shock pump that has a little flip lever that you use to depress the valve core after you've screwed the shock pump on then lift again before removal . I had one of those topeak adapters but didn't' get on with it, no problems with my Magura pump at all.
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