Thats a known issue.
You could try to change the atttachment from the Minimap to UIParent or something like your PlayerFrame.
If that doesn't work try to make a script or addon/paste it in:
https://addon.bool.no/
Something like:
/run function Movebuff() BuffFrame:ClearAllPoints() BuffFrame:SetScale(1.1) BuffFrame:SetPoint("CENTER",PlayerFrame,"CENTER",950,80) end hooksecurefunc("UIParent_UpdateTopFramePositions",Movebuff) Movebuff()
If you create an addon use the same code just without /run.
There can be issues with the default UI when you move Buffs and Debuffs separately since they are in the same cluster.
Some UI Addons like SUI have their buffs and debuffs edited/texture and you have different frames/names which helps with this problem.
Also there are other addons with the function to move your buffs/debuffs like: Leatrix_Plus.