Here’s a bug ….
One important change in these releases is that we are now adding a correction of 0.3 mm/year due to Glacial Isostatic Adjustment (GIA), so you may notice that the rate of sea level rise is now 0.3 mm/year higher than earlier releases.
An upwards correction on NASA financed climate data? Shocker – we’ve never seen that before.
Here is another bug. Your numbers are much too high. By a factor of four.
Bottom line? You are averaging large numbers (red areas below) having a very large uncertainty, with a group of small numbers – and coming up with a nearly meaningless global average. Hope this helps.