Rendered title animation doesn't match play back in program

I've used the "LowerThirdSimpleBoxThin" titles preset throughout my video (which is a pain in the butt to use because the duration it's on screen is hard to change). I've lengthened the duration of the animation of the title preset by playing with the "Retime Controls" and it worked great. Or so i thought.

It's perfect when played on the edit or Deliver screens, however when the final file is rendered the title animations get all messed up and don't match the in-program play back at all. Rather than staying on screen for 2 seconds the way they do when viewing on the Deliver screen, in the final rendered file they flash on then off screen in less than a second.

I'm new to this by the way, so this could definitely be a user error.

Help anyone?

Thanks a million
Don

Same here - I have used some Fusion titles and changed the title clip duration. I don't recall the exact moment but indeed the duration length got automatically changed for a short duration, even though the graphical representation of the clip in the timeline was still corresponding to the modified length.

P.S. by changing the clip duration forth and back helped to fix the situation (as I haven't done any edits afterwards I don't know if they stay with marked duration in playback).

I'm on Win10.

I've had the same issue, it seems that the number of frames of the Fusion comp seems to randomly change and become shorter. I fixed it by right clicking on the Fusion Titles that weren't working correctly and choosing 'Reset Current Composition". I hope they fix it in the next Beta.