I am in the process of replacing switches in my 1920's home which was renovated in 1970. While doing so I am creating notes of what wires exist and do not exist in each box. I found a light switch where the line in connection is hot, per my Klein non-contact detector. But, when I turn the light switch on neither the load or the line wire connections are showing up as hot, but the light is on. On the light switches I looked at so far, when I turn the switch on it results in both the line and load connection as hot.
Is there something wrong with the wiring?