Hi Stef, thank for your reply.
The report Designer.cs is saved correctly. I already cleaned and rebuild the solution but the problem remains.
Actually, the only diference I notice when I change the display expanded mark from true to false is the sinal (plus or minus) it shows in a different way. If I choose False in the option, the table will open expanded but with a + sinal. If I choose True in the option, the table will open expanded but with a - sinal.