Normal Map not working with image switches

I have a character rig with legs that are rigged reverse and normally on an image switch to change between them when needed. I also have a normal map for shading. When attached to the image switch, it for some reason makes the patched parts of the leg become either raised or lowered on the map. When removed from the image switch, the layers are fine, but if I plug one into the switch and leave the other unattached, the patch shows up again.

Hello OliviaBJohnson,

This looks like an issue our Discord MVPs could help you with. Our community MVPs are highly skilled animators that answer questions and support other animators on our Discord channel. Join them over here:
https://discord.com/channels/576095341523369984/576436694375464972

You might find this 1h tutorial on rigging useful as well: https://www.youtube.com/watch?v=7yxMbIhmyGE

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Hoping you will find the answer you need!