It is very odd.
I remember noticing this before and not getting around to looking further. It must be specific to my Proxmox version running on a Debian container as my EmonPi, recording exactly the same Input with exactly the same input processing is fine! Both running feedwriter.
And the pulse v kWh looks fine as well (on the EmonPi).
Data is via a directly connected pulse sensor via the pulse interfacer, sometimes runs slower than the feed interval and sometimes faster.
This shows it better - the diff is the same. Data gaps are where due to low consumption, there isn’t a flash.
[edit3] - final one…
I lied, the Feed on the Proxmox server is 10s and the Feed on the EmonPi is 5s.