Multiple activex combo box error

[Madhan2085]

I have multiple combobox used. When starting file first time i can able to edit any cells(Works fine)
But when i use the dropdown for the first time and try to edit any cell, the dropdown pops up automatically from dropdown combo box.

 

[Madhan2085]

Here is the file
https://www.dropbox.com/s/4wr6y4d3ga0h02j/Forum.xlsm?dl=0