I've been looking everywhere for a fix to this and I think I should just put it here.
I use the RSS/RO/RP1 suite of mods and also kerbalism. However, when I use them both, for some reason, the crew pods get messed up horribly. For example, if I use a Gemini command pod, the VAB description says the mass of it is 0.8939 tons but the engineer's report says 12 tons. This applies to every single pod and makes the game near impossible. If I need to send logs or screenshots, please tell me so I can upload them.