NaN Calculate Bug

Question 1

Calculate x = 4. Results in NaN

Question 2

Calculate x = 6, same issue

Answer · 2020-02-29T14:21:10.000Z

Calculate x = 6, same issue

Question 3

Calculate x = 6, also NaN

Answer · 2020-02-29T14:30:04.000Z

Calculate x = 6, also NaN

Question 4

I have it working on my PC, maybe problem is on frontend side?

Answer · 2020-02-29T14:40:42.000Z

I have it working on my PC, maybe problem is on frontend side?