Inaccurate Altitude

Samsung 10e. When I check my position the altitude reading always reads high, 50 to 100+ metres out. I also have the Viewranger app on the phone and which gives the same grid reference with a correct altitude reading. I prefer your app and the inaccurate altitude reading is not a big problem, just an annoyance. Have I got the settings correct? NMEA setting is unpicked.