Ssh reads it's config from:
1.- command line options
For each option, the first occurrence that is found is used. So, check that:
1.- you are not using strange stuff in command line, make sure you have no functions or aliases defined wich are superseding the ssh related commands.
2.- check ~/.ssh/config for "ClearAllForwardings".
3.- tell the admins the step you performed, and ask them for additional help and checks.