[Bug] numInstances: PropTypes.number breaks when numInstances are in string

[arunvc]

Describe the Bug

numInstances: PropTypes.number breaks when numInstances are in string

change

numInstances: PropTypes.number to
numInstances: PropTypes.any
```

### Steps to Reproduce

use any study where numInstances is configured as string

### The current behavior

error

### The expected behavior

handle numInstances as string and number 

### OS

Ubuntu 22

### Node version

18

### Browser

Latest Chrome and Firefox