Magento Customer Login Name Error

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I have a Magento store with more than 5k customers.

I am facing a problem when a customer log in to their account. The customer's name that appear keep changing to other customer's name. The price he/she see also keep changing. (please refer to the picture attached)

I just newly move to Magento and I move the customer contacts from old website by importing via CSV.

I would like to solve the this error as soon as possible.

Skills required:
eCommerce, HTML, PHP, Shopping Carts, Website Design
Additional Files: 1.jpg 2.jpg 3.jpg
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