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Well, are the layers actually all the same size? Mask coordinates are relative to the layer, not the comp. Otherwise this could be two other issues: a) based on the humungous size of your screenshot there could be a high-DPI screen issue (=bug) where AE miscalculates coordinates or b) there is something wrong with the RED footage stuff, which also has been plagued by bugs in recent versions of AE. Take a pick.
Oop, actually, they are not. The Raw Red Footage is 3792x3160 (2.0), while the comp (and sequence in which this film was picture locked in that I'm making the Linked Comps and doing VFX from) is 4096x1716 (1.0)
So yeah, maybe it's the mask coordinated to the 4096x1716 comp not gelling with the 3792x3160 footage.
But if that's the case, what's the ideal workaround when you're adding VFX (making linked comps) with a film's cut that's a different size/ratio from the raw footage?
If you want to put a mask on a scaled layer, pre-compose.
You are copying and pasting masks both layers should be at 100% scale.
Knowing that if you are going to have to paste a mask to a scaled layer than pre-compose before you paste.