Skandic carbide’s Probably hasn’t been replaced in 10 years of travel lol

I have a 2015 renegade. I had the 3 track idlers that are in line with the studs got the rubber part all chewed up, put 3 new oem idlers in and within 500km the same 3 were all chewed up again. The studs have some rust on the back of them was going to clean the rust of and put new idlers in. But I’m wondering if I’m missing something that would be eating up those idlers because it’s only the 3 that run over the back of the studs.