Exposure Metering Changes When I Hit Record, Sony A7Sii

So from what I've gathered about shooting SLOG2 is that you should overexpose by +1 or +2 stops. Been getting good results but wanted to see if anyone else is experiencing the exposure metering jump when you hit record.

Example: Before hitting record my meter will read +1, but then when I hit record the exposure metering jumps to +2 or above.

My Question: Which metering should I trust  A: Before hitting record (or)  B: After hitting record?

I don't own a light meter so I can't really do the tests myself. Thought maybe the community might have some insight on this. Thanks!