Doesn't do it in Image Line's FL Studio.
I don't have the patch you used but I loaded a clap patch* and set Pro-verb to match your settings.
*I used Clap Hall from Omnisphere's own lib, nuked the FX rack then added only Pro-verb.
The song/patch reloads without issues, even restarted FL Studio and loaded song - no change.
Something is changing your Predelay setting in Pro-verb to around 400ms when you load your project.
Have you tried creating a new song with only the patch and manually creating a new MIDI track and see if problem remains?
If so, maybe it's a bug in the patch - try finding another Clap patch (maybe the one I used) and see if it has same problem.
If all else fails maybe try contacting Spectrasonics support about this?https://www.spectrasonics.net/support/index.php