Hi rohits1577571 ,
Would like to know which application you are using in signing the documents. If you are using Acrobat Reader DC, please check that document should be available for Reader user as well.
If its not, then such issue persist.If you have received this form, check whether the document is having functionalities for reader user as well . Refer to this Link :- Creating and distributing PDF forms in Adobe Acrobat DC
Also check whether is this happening with this single document or with others as well .