Sysinfo on rpi3

I’m a bit at a loss why my system memory doesn’t appear consistent in openhab through sysinfo… below is a screenshot of my influxdb persisted item states and a TOP output from my OH server running on RPI3.

OH reports 417 MB free, 553 MB used … but TOP reports 73 MB free, 920 MB used.

The numbers don’t line up with the OpenHab service… but it’s closer. I re-read the wiki page… but I don’t think I have my items misconfigured… any help or insight would be appreciated:

Number SNS_Server_LoadAvg15Min		"Server Load avg. 15min [%.1f]" 		<cpu>		 		{ channel="systeminfo:computer:openhab:cpu#load15" }
Number SNS_Server_SystemUpTime		"Server Uptime [%.1f]"					<clock>		 		{ channel="systeminfo:computer:openhab:cpu#uptime" } 
Number SNS_Server_memActualFree		"Server Mem actual free [%.1f]"			<memory>			{ channel="systeminfo:computer:openhab:memory#available" }
Number SNS_Server_memActualUsed		"Server Mem actual used [%.1f]"			<memory>			{ channel="systeminfo:computer:openhab:memory#used" }
Number SNS_Server_MemUsedPercent	"Server Mem actual used [%.1f]%"		<memory>			{ channel="systeminfo:computer:openhab:memory#available_percent" }

Number SNS_Server_swapActualFree	"Server Swap actual free [%.1f]"		<memory>			{ channel="systeminfo:computer:openhab:swap#available" }
Number SNS_Server_swapActualUsed	"Server Swap actual used [%.1f]"		<memory>			{ channel="systeminfo:computer:openhab:swap#used" }
Number SNS_Server_swapUsedPercent	"Server Swap actual used [%.1f]%"		<memory>			{ channel="systeminfo:computer:openhab:swap#available_percent" }

Number SNS_Server_storageActualFree	"Server Storage actual free [%.1f]"		<memory>			{ channel="systeminfo:computer:openhab:storage#available" }
Number SNS_Server_storageActualUsed	"Server Storage actual used [%.1f]"		<memory>			{ channel="systeminfo:computer:openhab:storage#used" }
Number SNS_Server_storageUsedPercent"Server Storage actual used [%.1f]%"	<memory>			{ channel="systeminfo:computer:openhab:storage#available_percent" }