Labels appearing on the green 'squares' in the middle of the game area

[Malcom-Nubbins]

Issue:
Labels are appearing on the green objects that the player must strike with a ball. No other colour square has a label, which leads me to assume that the green squares shouldn't have labels either. Labels usually consist of '0', '1/2', and '*2'.

Steps to reproduce:

1. Start up a game and allow the squares to despawn and respawn.
2. One, or multiple squares may spawn with a label displaying a number/a couple of numbers.

Occurrence rate:
It can happen randomly, but frequently, so around 65% of the time.

Devices:
HTC Nexus 9 (Android Version 6.0.1, Marshmallow)
Windows 10 PC

[BartoszGrabowski]

These are placeholder spites for field gravity effects