Name search problem in sales register

I have noticed a recent issue within the search field in the sales and purchases register. It's a little hard to explain so bear with me. 

1. I enter a customer's name in the sales register and then click the arrow to drill down into the customer details

2. I then go back out of that customer card which takes me back to the sales register and the name of the customer is hgihglighted such that it is ready to be typed over to enter a new cutomer's name.

3. As soon as I enter the first letter of a new customer name, the whole name of the first customer with that letter comes up and then if I continue to type the rest of the customer name I am actually looking for, these additional letters appear at the end of the customer name on screen so it just becomes a jumbled mis-match. Even if I press delete before I start typing the new customer's name, I still get the full name of the first customer with that name and the same problem again.

The only way around this seems to be to hit delete, accept the new customer name and then backspace all of these letters to start again. This is very cumbersome and was not happening previously that I recall. It only seems to occur when I click into the card details first and then go back out.

FYI - I use this often as I am reviewing customers on a daily basis to put them on and off credit hold and need to go in and out of their card details to change their status whilst also reviewing their outstainding invoices from the sales register.

I realise their are plenty of workarounds to do this in other ways but this seems to be a glitch which was not in MYOB previous to recent upgrades.