Statistics card Bar Chart with multiple entities does not show all columns

I have configured multiple Statistics Cards as Bar Charts. I have two or more entities in this card. Unfortunately, it does not show all columns, it should show. For example with two entities, it misses the first column of the one entity and it misses then the last column from the other entity.
The following figure illustrates that:
image

The first two entities are missing for the first day and the last three entities are missing for the last day in the chart.

Here is another example:
image

ok, I lack in this case enough data for a whole week, but one can see, that the last bar is missing for the second entity.

In other occasions it just works a expected:
image

Is this a normal behaviour of HA? Do I potentially have something wrong in my configuration?

Thanks for any hint or help.