Welcome @Chris
How actually you open a new workspace? From that Home page? Could you provide a screenshot what exactly you choose?
Overall since this issue occurs across multiple computers and operating systems, it’s likely related to your Trello account rather than your devices...
I recommend clearing your browser cache and cookies, temporarily disabling any extensions, and logging out of all sessions. It’s also worth checking if any workspace automations or Power-Ups might be causing the repeated tabs... and asking someone else from the same workspace (if there is anyone also having access) to log in and check how it works for them.. The best test would be if they can log in on the same system that you are using..
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