Your keyboard is a complex machine with many buckling springs, some of which could move out of place during shipping/transportation as well as after daily usage. This is perfectly normal. To remove a key you can check out YouTube for “how to remove Model M keys.” It involves using some paper clips or a $6 key puller like the WASD Key Puller that I use. To re-seat the key, tilt the keyboard vertically with the spacebar side up and then put the key back. Test it a few times by pressing the key to make sure it buckles properly. Very rarely your spring may become mis-seated and you will need to put the spring back (see the keyboard forums for the “chopstick method” for putting Model M springs back in-it will be the same for these Model F keyboards; you can also use tweezers). An important note that the end of the spring must face the 12 o’clock position when you are looking at the keyboard; otherwise buckling error will be more likely. Also the spring must be pressed down firmly to the bottom of the flipper or the buckling will not be as forceful.