I saw a lot of errors in the error_log but was unable to replicate it.
Version 2.5.1.4 is available that has improved logging. I played over one hour 4 tabling with composite stats in the HUD and they never disappeared. The problem is some fixes were already done on the test version so it's hard to know if they didn't disappear because of that or a different cause.
If possible please email an example of the composite you're using to
support@notecaddy.com so I can try to replicate it. That is of course if the 2.5.1.4 version doesn't fix it.
For the composite constant I tried to replicate exactly what you did in the movie but it always worked for me