Exactly. Garbage in - garbage out.
It’s a classic fundamental misunderstanding of difference between NULL and 0. Between lack of a value and zero value. Missing data != zero, and missing data shall not be substituted with zeros in any calculations. Pretty basic stuff, brought up on this forum incessantly.
Storj (and related third party tools for some reason) consistently show nonsense. This has been reported multiple times, but it’s “low priority”. It’s not a bug in the implementation – it’s coded as designed. It’s the design that is wrong.
For a discussion on how infuriatingly wrong and unusable the dashboard plots are see this comment: New data not being stored - #12 by arrogantrabbit.