If you put a block of ice inside a dry pot, and put it on a stove with the lid on – the ice will melt and the level of the water will steadily increase. It will not go down for a few minutes and then come back up later. This is basic physics. As the number of molecules of liquid water steadily increases, the level of the water has to steadily increase too. There is no physical mechanism which will allow the level of the water to temporarily decline – even for one second.
If the ice caps are steadily melting, then sea level has to go up every year. Sea level can not be going down, and the ice be melting at a record rate, and ocean heat content be increasing. It is physically impossible, and if you start arguing that it can happen because of statistics – it is because you are spectacularly incompetent to discuss the subject.