https://www.blockchain.com/charts/difficulty

If I study the difficulty changes the last 6 months, I can see, as would be expected, that roughly every two weeks, the network makes an appropriate adjustment. However, I would expect this change to happen in a single block, whereupon the target attribute jumps from one value to another. However, upon closely inspecting the graph on blockchain.com, there seems to be a few intermediate difficulties within the steep slopes on the graph. For example, I can observe these three difficulties in a three day span:

13th of April: 3,511,060,552,899
14th of April: 3,796,188,328,005
15th of April: 3,893,316,899,029

How can this be explained? Were there two subsequent difficulty adjustments within two days? Or does the difficulty adjustment work slightly different than I imagine?