Class 153 Bug?

I don’t if its just me but I got this glitch with class 153, it’s these white half circles under the train

 

I've noticed that on a few other routes

 

It’s been logged down for investigation, I have it as well.

 

Which service was it on? If you don't mind.

 

For me on series X it's doing it on 150 and 153 it reminds me that wagon on German routes that has similar problem I know of hopefully can be sorted out

 

Will have a look-see later on. thanks.

 

2CO2 Penarth to Coryton