Do you mean that you can see the code of the .lfm file ? Like:
object Form1: TForm1
Left = 234
Height = 240
Top = 137
Width = 320
Caption = 'Form1'
ClientHeight = 240
ClientWidth = 320
LCLVersion = '1.4.2.0'
object Button1: TButton
Left = 176
Height = 56
Top = 25
Width = 108
Caption = 'Button1'
TabOrder = 0
end
...
Or that you can see the code of the concerned unit ? Like the 'Unit.pas' unit for the 'Form1.lfm' form.
In the second case, a wrong position for the form could be a possible explanation: look at the left and top properties of your form for the offending .lfm files in the object inspector.
Or your .lfm files might be "altered" in the first case ? Could you post one of them in this case (in a zip file for instance) ?
Is it happening only for this project, or even also for a new fresh project for instance ?