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Paypal api username, password and signature disappeared after version upgrade

Paypal api username, password and signature disappeared after version upgrade

Hi, 
I have recently upgraded version of a magento store from 1.9.1.1 to 1.9.3.6. All is working ok but in upgraded version paypal api username, password and signature is showing blank. I compared the database table core_config_data before and after upgrade both have same value for paypal api username, password and signature, still in upgraded site they are showing as blank from admin and  in front end its showing error for checkout. 

Can someone please advise how can it be resolved?

 

Regards
iwdnil