Theft of a Herne's Soul quest impossible to finish

Type: 

Bug

Severity: 

Normal

Game version: 

Morrowind

Concerns: 

TR_Mainland

Found in Version: 

Status: 

Item/Script Reference:

Identifier: 

TR_m1_MG_5b

Name: 

Theft of a Herne's Soul

Description: 

This quest kinda finishes, and questline continues, but it never removes from journal and Gindaman still tell you that you need give that soulgem to Absolon (looks like queststage 50 not properly working)
Also, during queststage 40 Absolon, when you return soulgem to him say same phrase that said when you give that gem first time, this is kinda odd.