UniFi integration not removing devices

I have the UniFi integration in and there are a bunch of older devices (at least 30) still showing up that are no longer connected, even some old switches I gave to my parents:

I’d like to remove these devices, but I’d prefer the integration simply forgot about them instead. Either way, I manually went in and clicked “Delete”, but they wouldn’t disappear:

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Is there a reason these keep showing up?

I’m hoping I don’t have to un-name them in UniFi. I like having the historical data to look back at, but if they all turn into MAC addresses, that data is useless.