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Some earlier bar end shifters that had indexing also had a friction option. Controlled by usually rotating a bezel or ring on the outer end of the shift pod. It is possible to have this ring partially positioned so that the index detents don't fully engage. Generally there were aligning marks to insure complete positioning.
Perhaps more info like the brand and version of the shifters might help us help you. It's easy for us to assume and be wrong. Shimano had a known failure issue with some of their earlier 9 speed bar end levers where the outer housing would fail and not contain the internals. The symptom was a vague lever movement into the next detent and a lot of "overshift/free play" between detents. Andy
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