The phrase "divergence problem" refers to a situation where a specific method or approach yields inconsistent or inaccurate results or leads to different outcomes. Full definition
How many other divergence problems are there, which have been interpreted as temperature signals. (climateaudit.org)
Thus, the study suggests that the current divergence problem is unique over the past thousand years and is restricted to recent decades. (skepticalscience.com)
As can be clearly seen, Yamal tracks temperature quite well, while Khadyta suffers from a noticeable divergence problem from about 1970 on. (deepclimate.org)