Cash burn / cash position question

Hi, in the October quarterly update I note the following:

• Company Cash position at 30 June was US$5.5m (Half yearly 4D)
• The Company’s cash position at 30 September 2021 was US$7.4 million. (Q3 update)
• Completed a US$6.7 million share placement to new and existing institutional investor

Looking at this, it seems PVS have burned through $4.8m in Q3. I know revenue was significantly lower in the quarter, but I wouldn't expect such a burn rate. Does anyone have an explanation for this?