Quotes are getting closed automatically once you approve it.

Hi Gurus,

Hope your doign great.

I am facing issues with quotes, they are getting closed automatically once you approve the quotes.  Quote will still remain in the approval phase but ticket status is closed and its becomes read only. It is happening for only 1 category. 

In the approval log you can still see approval is pending for an approval but actually its approved.

could you please let me know what is the issue over here and how to fix it? I have attached screenshot for your reference.

Many thanks in advance.