LZW36 slow fan speed

So I just installed one of these, and everything’s working like a champ in HA. The only issue is that the fan seems to run quite a bit slower than it did before. ie: The high speed is about the same as what medium was before, and low speed is just a lazy turn. I don’t know what model the fan is (it came with the house) but it’s a Hunter. It didn’t have a radio module before, and there’s only one wire to power the fan. The pull chain is definitely set to the high setting and not on medium.

Any idea what might be going on here? I was of the understanding that this switch should work properly with pretty much any A/C fan no?

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