Hello FM A320,
I would say go through the Airbus documents and get your seat position checked. Additionally have it checked when flying with an instructor or a line captain with sufficient knowledge with regard to seat position the next time - perhaps you’re sitting a tad bit low. A low seating position usually gives a feeling of moving a lot faster or sinking during the last few seconds of the landing. As mentioned above, on the 320 ensure you are not making drastic changes to the airplane pitch approaching 50 feet and on the 321 that would be 100 feet. You’ll notice that once you have got that covered, you are in a lot more control with respect to the flare for reasons well documents in the techniques manual.