This incident has been resolved.

Problem is now solved. Monitoring everything to check for possible inconsistencies left.

We just identified an issue on Rebrandly redirection level.
Links created or edited within last 24 hours which included URL encoded characters are failing to resolve to valid URL format.
As a result, destination pages which are relying on URL parameters values to perform redirection/deeplinking are being affected.
We just released a fix for new links which will be created from now on, and we are working on fixing all affected links.
Apologize for the inconvenience.