magento 1.9.4 after checkout process it doesnt take us to success page but on empty cart page

Job ID: 32750205

Budget: $10 – $30 USD

ONLY BID FOR COMPLETING THE TASK NO NEGOTIATION AFTER.

as the title suggest some time it takes customers to empty card page. rather then success page. but some time it works fine.it seems like cache issue but we are unable to diagnose the proper issue.
need a quick fix
Related categories: PHP JavaScript Magento eCommerce HTML