Some values in the first row are not shown in TDBAdvGrid


I've a strange problem.
I'm using a DBAdvGrid with different queries always with the same code.
Now someone found a bug that in the first row one (ore in another case three) field values are not shown in the grid.
In every case the datatype of the query is WideString.
I've enabled DataGrid.FilterDropDownAuto:= True and also in the list of values the value of the first row is missing.

Can anybody give me a hint, where to look after or how to fix it?


Very hard to tell without any details like grid property settings, code used, event handlers used,...

I've currently very little time but to get near the problem, I'm bulding a new app and add the grid settings step by step.