Is a raised baseline between T and QRS normal in any ECG lead?
I am not sure if I understand your question correct. What I can see here is a clear ST depression, that might be indicative of myocardial ischemia/infarction. The underlying mechanism is the shortage of oxygen in myocytes leading to elevation of resting potential and slowing of the depolarization -- this accounts for the elevated baseline after T. 

I am not at all an ECG expert, but I have seen the misplaces T-P segment many times while at medical school. It wasn't indicative for diagnosis, whereas all other segments were. 

So, why are you worrying about this segment?