I have a user with the same issue. She's an admin in both SFDC and HS so that isn't the cause. She's tried multiple browsers, incognito mode, both disconnected & connected VPN, and I think even different PCs. Despite a long thread with tech support, this still isn't resolved almost 4 weeks later. The issue didn't seem to arise until she turned on 2FA.
Would you mind trying to clear your cache following those steps, as well as trying with another browser and with an incognito window?
If this is still happening, I would recommend connecting with HubSpot Technical Support, as Support is included in your subscription and they will be able to provide real-time assistance for this matter, where you are able to share screenshots and specific example about this.