Trainer Showing too much Power

[Thelma Viaduct]

Real Turbo Muin B+

Lap Normalised Power
1 132W
2 170W
3 123W
4 170W
5 133W
6 170W
7 134W
8 170W
9 130W
10 170W
11 123W
12 170W
13 123W
14 133W


Stages Power Meter

Lap Normalised Power
1 125W
2 154W
3 115W
4 152W
5 127W
6 150W
7 130W
8 150W
9 121W
10 149W
11 109W
12 147W
13 107W
14 113W

How do I make my trainer more accurate, it's showing about 20W too much when I am at 150W on the Stages.
The MyElite App is a waste of time and can't find my trainer, so I can't calibrate it.

What should I do?