Over flow/fuge

Just came home from work and my return is blowin bubbles, usually means we need to add some R/O. So I added my gallon of ro water and I came back to still blowin bubbles????? Looked at the overflow and the water inside the overflow is even with the water in the tank. This is usally the other halfs area but he is out of town and not answering his phone. How do I fix this? HELP!

 

do you have a ball valve on the overflow drainpipe? it sounds like a clog in the drain line.

beyond that a pic of the overflow boxes would be helpful

 

I think I got it. The sponge in the overflow was completly plugged. So after cleaning that and a couple of mouthfuls of saltwater to get the siphon back it seems to be ok.lol Like I said, this is usually his area. Thank you for responding.