This is one for the attention of the administrators sooner than later. There is a post above by
@Kabam Miike that this is a simple display bug post 14.1update.
Sorry Mike, but that's not the case. Something very odd is happening to PI (as you know), but also the green glow does have a measurable game effect in the arenas.
This picture was taken a few minutes ago.

I then exited the Contest and restarted, and was faced with these altered values and green glow:

A screen grab at the end of my second fight shows the Boost effect in action:

At the end of the day, my points score has increased to 504,676 rather than the 500,563 that it should have done:

Now I could just keep quiet and get the extra points, but (1) that would be a bit unfair on anyone not taking part this week, and (2) although in this example my points were overall increased, I'm not sure that it's always going to be an improvement. I took this on the game before, and only in retrospect thought 'Hey, that's a really low point score for a 4* Vs 4* fight' if you look at Black Widow Vs Cap at the bottom:

So the arena points system is affected as well. For me, the changes happened only in games where I closed the game down and re-opened it. If I just kept playing, the glow and pi changes never arose.
I'm playing on Android 7.0 with a Motorola MotoG5+
Hope that's helpful in sorting a fix.