Weather icons changed into letters and numbers

My weather icons just randomly changed into letters and numbers. I have several spots displaying the upcoming weather, $wf(icon,1)$, $wf(icon,2)$ etc... And now instead of a partly cloudy icon, it's just a capital J... Anyone know why this is happening?

Did you clear the app cache?

I may have without realizing it. I just went back and replaced the icons in the group to fix issue