I am well aware I could simply increase the PlotRange to fix this, however, I'd like to keep the scale identical to some plots I compare this with. Also I haven't found anything about this and it only happens when I put a frame around my plots.
The green marks are mine. What I also can't figure out is why in the first image the cut off occurs right at the frame, while in the second example it seems like there's some padding.
Initially I thought the outlying observation is styled just like the respective line, but that is not the case it seems.
plots were created with Mathematica 11