There are 2 types of marks. The first is hard-coded and it sits at the "bottom" of the layout page. You can't change that. Above it is the Periscope mask on which you can draw any marks you want (it's a simple TGA). What both OLC and Mikhayl did was to just make the Attack Periscope mask a bit smaller so that it covers up the original marks completely. They're the same as in the original BUT, since you don't use the stadimeter anymore, they are calibrated to both the zoom level and the UJagd tools, so that they can work together. The UZO view was more tricky so they left it as it was, that's why you can see so many marks there, they're the original ones, but since the zoom level is 7X, not 6X, you can't use the marks to gather range data. As I recall, the historical UZO didn't even have vetical markings.
What I recommend is to get the latest OLC interface and place ACM on top of it. You get the improved horizon that OLC struggled to achieve
and they work perfectly together.