Record payments for invoice

Hi Everyone, Hoping someone can help with some guidance on how to resolve this issue. We have our Online payments setup and all funds received are meant to go into our Cheque account. This is set up under the Payment category for online payments. Unfortunately since last week around 16th/17th May, the payments are not automatically being allocated to the cheque account. We have been back into the settings twice and reset it to our cheque account however the payments are still not landing in the correct place. When you go into the invoice to see where the payment has been allocated, it has a blank spot under the bank account section. Some we can manually assign to our set cheque account, others won't allow the change. The ones that won't allow the change come up with a weird message to say 'you cannot change to payment as it is from a previous financial year.' This is rubbish as the payment was received last week and definitely not in last financial year. 

Screenshot attached of the 2 issues. One shows how the payment lands, not auto allocating to our cheque account. Second one shows the fault we get when trying to manually allocating the payment to our cheque account.

I feel like this is may be a software issue that has popped up after a recent MYOB update. Anyone else having this issue? Thank you for your help, Matt