The version number of kdenlive went backwards from 18.12.3_3 to 18.12.3 because of the removal of PORTREVISION in r503611.
A commit references this bug:
Date: Tue Jun 11 17:14:05 UTC 2019
New revision: 503971
multimedia/kdenlive: restore PORTREVISION
In r503611 the PORTREVISION was mistakenly dropped (kdenlive is at the moment
held back at a lower version).
Submitted by: Ting-Wei Lan <email@example.com>
Fixed. Sorry about that.