SAPScript: why the window only show the LAST line

Dears,

In my form, one of the window only show the LAST line of the it.

I have set the window enough space,  also when  debuging the program , open_form, write_form,

all of those sy-subrc = 0.

both static texts and dynamic texts are set  in the window,   but only the last line shown.

Anyone could help me?

Thanks a lot.

Sincerely,

Julie Lv