I own Orpheus and I haven't experienced this issue. I've used multiple different shaders on it thus far including Iron Wolf, Raid Shader, and New Monarchy shaders on it with normal effect.
This may sound dumb, but can you confirm that your actual shader count is going down with each application? It sounds like maybe you're previewing instead of applying.
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Yeah it was going down, and trust me, with some off the issues on here that doesn't sound as dumb as it sounds likely. I haven't tested it lately because I was tired of losing shaders but it may be a connection issue. The armor stays shaded until I switch it to a different piece of armor.