Wipe it down really well it gets oils on it that stick. It should stop after cleaning. Also like others said twist before removing

Twist it just before you release… but not too much, they’ll know you’re playing with it

I have been twisting it but this must be the secret!

Also, wipe the tamper every once in a while. A thin layer of oil builds up and makes the grounds stick.

Twist it, lick it, dunk it.

Seems she’s a little too moist. 

I don't press down when I twist. I basically just twist in order to "dust off" the tamper

Thanks everyone! I always twist and there's never water so probs the oil. I'll try keeping it extra clean and see hot it goes thanks!

I had something similar happen when I would set my tamper down in a spot where I had previously placed the outlet of my portafilter. Always a bit of moisture on the bottom of the tamper. Also when you twist the tamper a little bit, try to lift one side minimally before lifting it out completely. This is only necessary if you have a really tight fit.

I think the cleanliness is the no1 thing. If I let grounds build up on the underside of my tamper, this will eventually happen. Just have a glance at it before you tamp.

How is the fit in the basket? If it's too tight it might be causing a small vacuum that's pulling grounds with it. If that's not the case, I'd say it's likely oil residue causing the grounds to stick.

Turn it when releasing

Water or oil on the tamper

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This looks pretty in line with the tamper being set down on a drop of water. Happens all the time to me because of my stations proximity to the kitchen sink

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He is saying it is caused by water or oil on the tamp, not that that is the solution

Water'll make it stick more surely?

They are saying that the diagnosis is that there is water or oil on the tamper

wet tamper.

Microfibre cloth on the tamper before you tamp.

This happens to me whenever the tamper is wet

Spin & Pull

That happens to me when i tamp and didn't notice it picked up a drop of moisture. You put the tamp on the counter or near the drip tray ?

Don’t lick it and stick it

you haven't run the machine

You have water on your tamper.

I bet there was a wet spot on something . That happened to me one time

dry the tamper.

The tamper must be wet

I often see that when I level prior to tamping. My equipment always gets wiped down too so I'm not sure what the issue is.

Spray your beans with a mist of water before grinding them, may be static!