One thing that I know could be a factor is if the LAT is of the E, the leading zero needs to be used. So if you have E 41 40.987 it needs to be entered as E04140, select enter and then input the decimal value. Also all leading zeros need to be entered too. 040 04.098 should be entered as 04004 etc.
If you can grab a track and share, we could help narrow down the issue.