Why do the highres muzzle flare expand tags used in the zteam and cmt tagsets only show up half the time, and usually only on cmt/zteam weapons, if then? I mean I've tried to set up muzzle flash effects using these sprites on other weapons, and all other particles I set up will show but the muzzle flare tags. Or I'll modify the radius of one of the muzzle flares and it then will stop showing up ingame. I've been making effects for years, but I'm definitely not the best at it and I don't quite understand what I'm doing wrong. If anyone could give me an explanation on how I should be setting up these muzzle flares differently from the default sprites or what I'm doing wrong I'd be very greatful.

You have to make sure that you have set up the relative direction and relative offset correctly. The muzzle flare particle tags are set to "parallel to direction" so if the above are not correct, you wont see them in fp because they will be pointing forward.