What causes scoreboard flashing and can it be avoided?

I've been working on this scoreboard toolset for a while and up until today I haven't had flashing issues. However, once I made a scoreboard with a time to next game line, I started getting very quick flashes at random points every 20 updates or so. I watched it for a long while and I couldn't pick out any pattern. The board is updating once a second to show the time to next game line. Is there a better method to reduce the frequency of or eliminate flickering?

 

SaxSalute

https://forums.bukkit.org/threads/scoreboards-keep-flashing.283360/

https://forums.bukkit.org/threads/correct-way-to-update-scoreboard.188092/

https://forums.bukkit.org/threads/scoreboards-keep-flashing-am-i-doing-something-wrong.174265/
Hopefully that can help you

Also view
http://forums.bukkit.org/threads/update-a-scoreboard-every-second-without-flashing.288265/

As always fireblast709 is right on the point with his answer and it provides the necessary detail

 

Do your calculations first and then remove/re-add within the same two lines for the score. Or just use a scoreboard in a relevant manner (with the scores).

I've also put time output in the display name of the scoreboard instead.

 

Thank you! I got a few ideas from those on how to improve my toolset.