TListview fails to set font size, boldness or colour upon 1st display - in 10.4

This worked in 10.3.  The exact same code now displays incorrectly at first in 10.4.  When the listviews are re-displayed the fonts etc change to my settings.

.Any solutions please?   The exact same code worked in 10.3 on both Android & IOS. 

Now in 10.4 all my Listviews in my project show the wrong font size, colour or (in some cases) boldness at first. 

As soon as they are re-displayed, they then show correct colours, sizes etc from then on. 

Can anybody suggest a workaround and can Embarcadero please explain this 10.4 "new feature" / BUG ??? please?  - Thanks  John Jefkins