The fact that in all of the images of tracking the EGLLLEMD route, you appear to be off the route by the about the same distance, makes me think that your alignment is off by that margin.

For testing purposes, I recommend that you do the Zero Drift Error Feature.

Zero Drift Error Feature:
- data Selector - DSRTK/STS
- press REMOTE
- when REMOTE illuminates you will see increasing digits on the left display
- press key 3
- REMOTE will extinguish
- if you press REMOTE again
- you will see 0

Drift error is erased and will not increase in the current flight.

This way, the L-1011 will always be on the magenta route line in the map, so if your alignment is off, then you will know that's true, and not the drift error that occurs over time with the INS.