Expected behavior - When Instant Mode is enabled it applies “invisible” pitch deviations to notes, and when disabling Instant Mode those pitch deviations are applied to the notes via the parameters panel
Actual behavior - When multiple copies of a group are present in the arrangement and Instant Mode is toggled off, the pitch deviations are applied to the group’s notes once for each instance of the group in the arrangement. For example, with 4 instances of a group in the arrangement, a 100-cent deviation becomes 400 cents.
edit:
Related Bug - Groups that are not present in the arrangement do not have their Instant Mode pitch deviations applied as parameters, indicating that (like above), the process is iterating through all note group references on each track rather than only processing each track’s main group and each note group in the library once.