Jeep Wrangler TJ Factory Multi Function Turn Signal Switch 97 00 Stock J3 | eBayChances are it's a broken canceling actuator in the turn signal switch. It's a little lever that hangs out the right side of the switch that is triggered by cancelling cams within the steering column. You will most likely need to replace the turn signal (multi-function) switch. It's a pretty easy job.
You can get them out of dodge neons in junkyards for 15 bucks. . I did so recently On my 2000. 2001 is different. You should be good With a 98'.Jeep Wrangler TJ Factory Multi Function Turn Signal Switch 97 00 Stock J3 | eBay is it the little white post that sticking out there on the right?