Hi @MaudeLD,
Yes the rates are wrong. We find a few problems, s.g Editorial activity statistics look strange - OJS 3.4.0.4 - #18 by mreedks, that are fixed within this issue Improve Editorial Activity calculations · Issue #9813 · pkp/pkp-lib · GitHub, and will be available in the next 3.4.0.6 version.
Thanks!
Bozana