@Nitren That is indeed a ML Monster packing, denoted by the 4 lines. Super macaron is a single wavy line, MR is a wavy line plus a raised dot. I don't much experience with the Monster so I couldn't tell you if that's a common problem or not. I've never seen that issue with the newer ML packings. I've been quite a fan of them, especially the new 2021 silicone models, but I'm also a fan of the Begadi packings, especially the longer contact patch models.