Every time I relog/reload the PVEFrame (Group Finder) scale is resetting to default.
All other frames' scaling data are persistent between sessions.
Version: Retail 9.2.0

it seems some other addon is causing this.
try disabled all addons except blizzmove, and if it works, enable a few addons at a time, to see what breaks it
if you tell us what addon breaks it, we can see if it's something we can/want to fix, or if you should make an issue on their end :)

Thanks for the tip.
Premade Groups Filter is causing the problem.
It uses SetScript instead of HookScript to set it's event handler to PVEFrame.
I will contact it's author to correct the code.

thanks for the heads-up, I'll close this issue then :)