Hi Chouby!
I come bearing great news! My colleague was going to try and create a custom plugin to filter the domain mapping, but somehow everything seems to be working now?
There was a field in the database with a double // at the end, maybe fixing that was the solution?
Anyway; things seem to work fine now! I want to thank you again for all your replies the last couple of days/weeks. I wish you all the best :) You're a great guy! Keep up the good work!
Cheers!