You really got to stop relying on these polls, every single poll is different, that's because they just randomly call people, if they call more democrats than republicans the results will always be more unfavorable. In another poll in the state it was tied:

North Carolina voters are divided on impeaching President Donald Trump, according to a new poll from Raleigh-based Public Policy Polling.

The poll, released Wednesday, found that 48% of voters support impeaching Trump while 48% oppose. Four percent said they were not sure.

See...it all depends upon who gets called.