Net advance payment deducted from furlough payment - is this ok?

AnnaM_2

Whilst I was checking my payslips and trying to make sense of my furlough payments I noticed that in May my deductions were unusually large.
When I looked closer it said that one of the deductions was a 'net advance' of £450. I have never requested an advance from my employer/ bought anything through the company and was confused until I checked my bank statements, where I was reminded that I was paid exactly £450 for the hours I'd worked and submitted a pay claim for, for March of this year. This payment made in April is not recorded on our online portal for some reason. I was not on furlough in March, and expected my employer to cover the payment for those hours in the normal way. 
Have I effectively paid myself for March with the government furlough payment made to me in May?!!  Thanks in advance.

Jeremy535897

It sounds like your employer has made a mistake. A furlough payment, by definition, cannot cover hours actually worked.