This is an issue with the Via routing of which airnav are aware. TAY14F has been operated for some considerable time. The routing is Aldergrove-East Midlands-Brussels. The bug means it only displays the first sector on the routes. As you are in Belgium, you will also note the error on all Jet airways flights that operate from India, through Brussels and onto North America.
It is unfortunately another in the very long line of small bugs, which continue to accumulate. Airnav state they will only fix the bugs when a full new version is developed, rather than using small software patches to fix bugs quickly, like most other major software developers practice.