Tiles: footer calculations gets removed when using Setup Wizard

I noticed a bug while using Vizlib Tiles, having to do with the Setup Wizard. 

I had a footer with some expressions to calculate certain values. I then made some changer to another layer (it doesn't matter which one) in the Setup Wizard. I then noticed that whenever you open the setup wizard, all the calculations in the footer (and probably the header too) get set to latest value instead of the expression. 

For example:
 =${vMeasure} suddenly becomes ='200304'  when you open the setup wizard.