Use physics package would break brackets

[abnerlee]

See demo in https://codepen.io/abnerlee/pen/BamQZrp

The size of () seems incorrect, but if you remove physics package, () looks correctly paried.

[dpvc]

Thanks for the report. The code that determines the argument is matching the wrong close parenthesis.

One work-around would be to use additional braces to "hide" the inner parentheses. For example

\exp({(\frac{a}{a}a)}{a})

would be a way to get the desired result from your codepen expression.