Not Pasting values in Excel file

Hello,


I would like to know that I have a Excel Macro Enabled File.

it has macros, sheet vba code, modules and user forms code and no merging cells

but problem is that whenever or whatever I'm trying to paste any values, it's not pasting the values

just shows once action that pasted and in a second it automatically removes the values not only from the file but also from the memory.

Please help me to solve this unique problem

Thanks