Wiring Baseboard Heaters

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I have been replacing some of the old single pole thermostats in my home which control my electric baseboard heaters. There are 2 units connected one breaker and 4 on the other, which I will call breaker a and b respectively.

I have been very careful that i match up each of the (2) wires to a new thermostat to the same they were connected to by the older unit. As I have done so one heater on breaker a quit working, and one heater on breaker b that hasn't worked since before we bought the home began working while another one quit working?? Am i missing something here? can you offer any hints or advice. Thanks!