score:1

Try to change

<SplitButton title={this.state.title}>

to

<SplitButton title={this.state.title} id="splitButtonMenu">

score:2

dropDowns need a valid id, because it is a required prop for the component.

ref: https://react-bootstrap.github.io/components.html#btn-dropdowns-props

Provide an id to the component. It will work fine.

<SplitButton bsStyle={title.toLowerCase()} title={title} key={i} id={exampleId}>
      <MenuItem eventKey="1">Action</MenuItem>
      <MenuItem eventKey="2">Another action</MenuItem>
      <MenuItem eventKey="3">Something else here</MenuItem>
      <MenuItem divider />
      <MenuItem eventKey="4">Separated link</MenuItem>
</SplitButton>

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