New vegas weapon mods not working

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Others will be labeled 'MOD: MOD: Laser sight' and others again will be 'MOD: MOD: (GRA) Laser sight' (I've used laser sight as an example but it happens with a lot of different weapon mods) and this is where I get lost.

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'MOD: Laser sight' which should be the correct tag as that is added by PN.

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Consequently I have tons of weapon mods in my inventory with different labeling format. I also have PN which has a sorter that labels weapon mods with a MOD tag. I have all the DLC, so some weapon mods have a (GRA) tag. I suspect it may be a conflict between some mods and have to do with the way they are being labeled, but I can't figure out what's going on so I'm hoping for some community input here.

I'm having a problem with not being able to install some weapon mods on some of my weapons even though they are clearly made for that specific weapon.