unwanted duration changes after leveling a multiple project MPD fi

[eugene76]

HI,

I have a MPD file with multiple resource sharing projects. When i level the
resources some of the durations change in the projects.
Summary of settings;
-fixed duration tasks
-multiple resources
-two calenders (standard default, & 24hr)
-projects have different priorities, although none have 1000 assigned.

any suggesstions?

thanks in advance!