Exponents not displaying correctly in calculated questions with wild card variables

Exponents longer than 1 character are not displaying correctly in calculated questions with wild card variables.

As an example I've created the following question:

Question text:

$$ {e} \times 10^{f} + {g} \times 10^{h} $$

Wild cards:

f and h have values in the range of 10-20

e and g have values in the range of 1-10

Answer formula:

*pow(10,{f})+{g}*pow(10,{h})

Display should look like this:

But displays like this:

If I use specific numbers as exponents it displays correctly.

Example: $$ {e} \times 10^{15} + {g} \times 10^{12} $$

Usual troubleshooting like changing theme, using different courses and trying different browsers has been conducted.