The X11SSL-LN4F will show two power supplies under IPMI Hardware Information page, can you check whether there is anywhere in BIOS cause two power supplies show up under IPMI Hardware Information page?
This looks like Power Supply issue. The PWS-333-1H does not support pmbus traffic. BMC cannot detect power supply sensor. So, IPMI cannot display correct information for installed PSU’s if they don’t support PMBus