Is my employer investing my provident fund contributions?

We have no way of knowing or finding out whether your contributions are invested in your provident fund. You need to find out who administers your provident fund and request a benefit statement from them. This will give you an idea as to how much money has been invested in the fund. You should also talk to your payroll department, so that they can explain your payslip to you. It may be that for tax reasons. Your provident fund contributions are classified as 50% being your contribution and 50% as being your employer's contribution (paid by you by way of a salary sacrifice). The "employer's contribution" would then not show up as a deduction off your pay; rather, your salary would be shown net of the employer contribution.