So from what I know about Voxtelesys and based on your screenshots you need to have only 1 registration trunk with both numbers in the same trunk. My guess is that the calls from both DIDs are coming from one trunk with the same rinstance so they are routed to the same destination.
Do the following test:
Change the Default trunk destination of the TC trunk (the one that routes correctly) to your extension. Then call the 4090 number. Does the call come to your extension?
If yes then just add the 4090 number to the TC trunk and delete the other. Then route the DID to your Ring Group.
If the issue persists then you need to create a ticket so we can take a look at your configuration.