This toolbar cannot create more than one button with id

I’ve started getting the same error as of a couple of days ago. It seems that all of my local plugins are producing this error, although all the errors give the id of the same plugin. When I remove that plugin, the error ids just point to another plugin. It’s like it loads one plugin, then tries to load the rest under the same id. Because of this, only 1 of my local plugins will end up loading when I open a place, and the rest don’t show up at all. The one that does load works just fine, however, so there’s that.
Also, this happens not just when I open a place from a browser, but also when I open Studio first then select a place.