If
[Type 1].Name is a formula that references [Related Type 2].Name, and
[Related Type 2].Name is a formula that references [Type 1].Name,
you get an infinite loop with ever-growing Names 
This may also be true for other formula fields – I only tested Name formulas.
Yeah, I’ve discovered a few ways (by accident) to get stuck in infinite loops 
I think that the Fibery team know the possibility exists (and that they plan to fix):
Similar things can happen in Coda, and I’ve had occasions where the only fix was to delete the table 
We will fix that problem in the nearest future. If loop is detected, following formula calculation will be stopped.
Just adding a note that formula loop detection has been implemented (quite some time ago!)