Slack tries to install app every time

Hi - I’ve been using the Slack plugin to login into my app (https://sets2.bubbleapps.io/version-test/), and it works pretty well, but one thing I’ve realised is that it’s trying to install my Slack app every time I login, like below:

The Slack app is definitely already installed in the workspace the person is logging in via, so it shouldn’t need installed each time.

I’m guessing that the problem is at the Slack app end, but wondering if anyone here can help?