Strange SEF Pagination Links?

[randomdev]

vm2.0.14

For some reason if I go to a sub category and look at the page 2 or next page link I get
/category/results,13-12

If I choose another number from the limit box like 8, then choose 12 again, I get the following which looks correct
/category/results,1-12

Any idea why I get the weird numbers using default pagination?

I also noticed if I am visiting a top level category I get a different link again:
/category?start=12

Then if I choose 8 then 12 from the limitbox like before my link looks normal:
/category/results,1-12

Disabled my template but it didnt seem to change the links.