Pixel value

I am trying to see the pixel value at the coordinate (lon=3.80215001106 and lat=43.2914390564) from the sentinel 3 image (S3A_OL_2_WFR____20180226T094257_20180226T094557_20180227T154615_0179_028_193_2160_MAR_O_NT_002.SEN3).
When i import with a pin from a text file (1709_CPHL_PRES) i get another pixel value in contrast when i import lon and lat manually (Pin 40).

Attach screenshot

and text file
pins.txt (338 Bytes)

Any ideas?