We haven't heard back from you, so we'll consider this resolved for now.
Make sure your switches are successfully scanned through SNMP, which will allow Lansweeper to retrieve their MACs and use those to uniquely identify the switches. Scanning multiple IPs of the same switch will not result in multiple assets under this setup. More info on testing a device's protocols can be found
here. Info on scanning network devices can be found
here.
Keep in mind that you may need to
delete any duplicate assets (without an OID or other SNMP data) that have already been generated. If you delete them and set up SNMP scanning correctly, the duplicates should not return.