Could ye' possibly post some screenshots of the problem in hand? Or if possible, it'd be really helpful if you could post your marking files and coding here so we could see if there's something wrong that maybe you've not noticed? c: Though if you don't feel comfortable posting your marking files here, feel free to send them to me over PM~
As for the skeleton one, do you mean it comes up as the skeleton marking? If so then, by any chance, have you got your marking at the end of your markings list because there is a limit to how many markings a player can have before. After it reaches the limit of markings it can have, it just replaces the texture with some of the default markings for some reason.