I tried some other cables and all have a little in and out movement. I even got out some old retired devices to try. My original pixel 1 clicks in nicely and also moves in and out a bit as does my wife's Galaxy S9. I think it's normal. Some are likely more noticeable than others but it seems that the "clicky" feeling USBC ports all exhibit this characteristic (the pixel 1 and my wife's S9 both have the clicky feeling when you plug it in too). My pixel 3 has a more mushy less clicky tactile feel to it but has no movement at all when plugged in. Tommorow it's off to Best buy to do some USB C port testing. Lol