I commuted in the Bay Area for years on my ZR-7S. Used to keep my FasTrak transponder in my front jacket pocket. It would scan fine, but the cameras would get confused and I was constantly being charged a full toll as if I was a multi-axled truck with a trailer. After several complaints to FasTrak I had a customer service guy tell me to keep the transponder with me, but in the protective RFID bag so it wouldnt scan. The cameras just deducted the toll from my account based on my license plate and I never had an issue after that.
Hope you can get it sorted out. Commuting in the Bay Area on a bike was the best!
2006 Suzuki V-Strom 1000
2008 Kawasaki KLR650
2003 Kawasaki ZR-7S
1980 Kawasaki KZ550 (Cafe Racer)
1990 Kawasaki EX500
1983 Yamaha FJ600
1981 Honda CM400T
“Sometimes it takes a whole tankful of fuel before you can think straight.”