We have an analysis which seems to be skipping data at certain intervals. As you can see on the picture, we have an analysis which basically extracts two tags from each other (brown minus yellow) and calculates the difference (blue)
As you can see on the graph, the analysis which does that at regular intervals disregard one of the values and gets a difference equal to the other value.
The analysis looks like this
As you can see the only "special" is that we are calculating 2 days in the past.
I have no idea why this is happening.