Formik losing selected values after button click - reactjs

Question

I have a form with some inputs of type "select". One of them works like: The user selects one service and click on "Add" button to add to a list of services, but after this click, the previously selected values (cliente, funcionario) are getting empty.
<Formik
enableReinitialize
validationSchema={formSchema}
onSubmit={(values, { resetForm }) => {
entry
? props.setSubmit(values, entry.id)
: props.setSubmit(values, resetForm);
}}
initialValues={defaultValues}
>
{({
handleSubmit,
handleChange,
values,
errors,
touched,
setFieldValue,
}) => (
<Modal
show={modalForm}
onHide={handleClose}
backdrop="static"
size="lg"
>
<Modal.Header closeButton>
<Modal.Title>Preencha o formulário</Modal.Title>
</Modal.Header>
<Form onSubmit={handleSubmit}>
<Modal.Body>
<Combobox
label="Cliente"
name="cliente"
onChange={handleChange}
value={values.cliente}
errors={errors.cliente}
options={customers}
/>
<Combobox
label="Funcionário"
name="funcionario"
errors={errors.funcionario}
onChange={async e => {
handleChange(e);
setFieldValue(
'comissao',
await loadComission(e.target.value)
);
}}
value={values.funcionario}
options={employees}
/>
<hr />
<CustomCombo
className="cbwbuton"
label="Serviço"
name="servico"
onChange={handleChange}
value={values.servico}
options={services}
>
<Button
variant="outline-primary"
onClick={() => {
console.log(values.funcionario);
addServ(values.servico);
}}
>
<i className="fa fa-plus-circle" />
</Button>
</CustomCombo>
AddServ function:
const addServ = async id => {
if (id !== '') {
try {
const newServ = await api.get(`/service/${id}`);
await setServicosRealizados([...servicosRealizados, newServ.data]);
} catch (error) {
console.log(error);
}
}
};
On screen the values "cliente" and "funcionario" still selected, but these values is empty on output json when I submit. Could someone help me with this issue?