Math Expression Not Evaluating Properly

I can’t for the life of me work out why this Expression (from Plugin: Toolbox) is not evaluating correctly.

The number result it outputs is 1020. The correct number is 1104.67. Because there is no incremental evaluation of a formula I can’t work out which parts are not being evaluated. I have tried including/excluding brackets in different places.

Any ideas?


Screenshot 2021-10-28 at 10.53.51

The same output is generated across multiple “expression”-type plugins.