hi, I checked, S5320 supports 802.3af(15.4w) and 802.3at(30w), and the the it's same for the S2700.
I think you can check if the PoE consumption has reached the maximum power that the s2700 could supply.
A device provides power for PDs in conformance to 802.3at(poe+) by default. if you changed it to poe, you could use command undo poe af-inrush enable to resotre the default setting.