According to the website, I can read this: The most recent Impact Factor for Experimental Diabetes Research is 3.536 according to 2013 Journal Citation Reports released by Thomson Reuters in 2014.
It seems as Journal of Diabetes Research and Experimental Diabetes Research are two different journals (different ISSN) with different IF (according to Thompson Reuters).
Experimental Diabetes Research has IF 3.536 according to 2013 Journal Citation Reports released by Thomson Reuters in 2014), and Journal of Diabetes Research has no IF according to 2013 Journal Citation Reports released by Thomson Reuters in 2014.
It seems that things are getting more clear to me.
Can anyone tell me whether the impact factor of Journal of diabetes research (Formerly known as experimental diabetes research) has been degraded from 3.536 (2013) to 2.164 (2014)