Hello @Networld, welcpme to the forum!
My guess is your 2.0.4.5 is coming from the Duplicati updates folder (check ~/.config/updates).
When the base version (2.0.3.3 for you) runs if it finds a newer version in the updates folder then control will be passed to that newer version.
Note that per the below post, the lowest version 2.0.4.5 can be easily downgraded to is 2.0.3.12.