I have created multiple masks in a minute animation I have been working on. They are masked perfectly in AE, but when I make a render two of the masks seem to glitch slightly showing things that can't even be seen on the AE file.
God knows what's going on. Any help would be much appreciated.
I've just circled the problem areas in red, which should be flush to the edges.
Without seeing your timeline with the relevant properties revealed, the comp with teh actual masks visible and additional info like version of AE, exact render settings and so on we can't tell you anything. Sorry, but just providing heavily cropped snapshots of your render is not at all useful.