To me this looks like a duplicate of #1729 - the problems are caused by the extra tab at the top which shouldn't be there. To summarise what you could try to fix the problem:

1. In macOS Settings set the value of "Dock->Prefer tabs when opening documents" to Manually.
2. In Geany menu bar try selecting "View->Hide tab bar"
3. As suggested in #1729 you might want to remove a GTK installation from homebrew or some other package manager which might conflict with Geany.

I'm closing this issue as I think it's a duplicate of #1729 and the discussion can continue there. Feel free to reopen this bug report if you think it's not the case.

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