All my optics are from fs.com. Their modules is far more cheaper and quality is also good. They built a new Seattle warehouse, the shipping is fast. And I heard last month they started provide free shipping to the US.
SFP+ cable cannot plug into SFP port. You can go straight to fs.com to buy cheap 1G copper or fiber SFP. Custom & OEM HPE Gigabit Ethernet SFP Transceivers | FS.COM
Are you sure the modules that you have bought are compatible with the UBNT switch? Have you checked the compatibility list? https://help.ubnt.com/hc/en-us/articles/205220850-EdgeSwitch-Which-SFPs-are-compatible-with-the-EdgeSwitch- https://help.ubnt.com/hc/en-us/articles/212561258-UniFi-Which-SFPs-can-I-use-with-UniFi-switch