I'm not exactly sure what caused it, but my follower now only moves at walking speed. If I get too far away, the follower attempts to run in an almost sprinting in place fashion since it retains walking speed. I've tried everything from reloading, dismissing, killing/reviving, and setting movement speed in the console. Sadly reverting to an earlier save isn't an option. Does anyone know a solution to this?

Are you using a follower mod(s)?

If you are then please post your loadorder.