Propane smell - help

Just had the tanks topped off on my TT. Went and set up for the night and there is a smell of propane coming from the vicinity of the regulator between the tanks.

Did the tanks get overfilled or perhaps they spilled? Heat and water heater are on and working fine. The smell is pretty faint and outside only so I doubt anything bad would happen but it does concern me.

Checked the connections to the tanks and they seem fine - I have not tested with soap bubbles yet.

Any ideas and should i be concerned?

Thanks!