Wich version of ecoinvent are you using? (e.g. the regionalized one?)
Which is the exact issue are you experiencing?
Anyway, I suggest you to use the 2.0.5 verison of the methods if you are not on 3.6 and select the non regionalized version of ecoinvent, if it is feasible of course. Anyway, the description you see in the method section sohould came directly from Pré, so it may not be related to the version adapted for OpenLCA.
Another way could be to download the methods set which are specific for the ecoinvent db you have: "ecoinvent LCIA methods".