When you join as an FPS pawn correct? I made the characters be rotation authed on the server so that rollback works better for VR characters (the offset means they work differently than std engine characters).
You need to follow the last step of the migration guide from 4.18-4.19 to fix it (FOR FPS PAWNS ONLY): https://bitbucket.org//vre…19%20Migration
is already pre-set in the latest template but you are working off of a very old version.
Also I would suggest you follow the migration guides in the future.
As for 4.19 - 4.20, the migration requires no real special effort aside from the Interactible settings being removed.