in form's grid,the last field always declares twice!

Hello Guys,

In my form’s grid. last field always declare itselfs twice,I am seeing double of it.

I tried

clean AUC files and clean usage storage.

add empty field on grid and turn the visible false.

but did not work it .do you know any method ?Have you across this problem?

Is that a custom form? Is that happening for all users?
Have you tried by deleting the Grid and recreating it?