I have never had this problem. In my Wichita Falls and Waco mapping it only shows LTE signals. In Waco, I always had full bars of 1x signal because it is a CDMA 800 market, and yet it clearly shows all over that market the LTE signal strength very clearly and separate from my 1x.
It is also clear to me looking at my Wichita Falls mapping that it shows LTE signal strength very well, also. There are four sites that have not received LTE around the city, where I encounter very strong 1x signals and very weak LTE signals, and these are all shown as weak LTE signals.
I did once receive a PM from a member in Puerto Rico who has a Galaxy Nexus that he had a custom MOD on and he said all his Sensorly reporting around the San Juan area was coming in at full strength, no matter what his 1x and LTE signals actually were.
Are you using a custom MOD? If not, then perhaps you are mistaken? I guarantee you that Sensorly IS NOT harvesting 1x data as LTE signal data. However, your device may be mistakenly providing that.
Robert