Ion-range not displaying properly


Sorry, new at this. Using Visual Studio 2015 and started with the tabs demo.

I added code for a range item and it isn’t displaying properly at all. I should have 4 range (i wish they were called sliders) on this view, but the botttom one, which is ion, just shows a box. The top 3 are non-ion. What am I doing wrong:

Here’s the code: