[Python] Django forms ChoiceField not selecting the wanted value

I created a django form (IssueForm) which is meant to be used to register an object which is instance of one of my models (Issue). Following are the model:

model.py

class Issue(models.Model):

TYPE_FIELDS = [
("Math", "Math"),
("Physics", "Physics"),
("Programming", "Programming"),
("Arts", "Arts")
]

issue_text = models.TextField(default="Please insert text")
issue_description = models.TextField(default="Newly created")
issue_deadline = models.DateField()
issue_field = models.CharField(max_length=30, choices=TYPE_FIELDS)
published_by = models.ForeignKey(User, on_delete=models.CASCADE, default=None)

def __str__(self):
return self.issue_description


the form used:

forms.py

class IssueForm(forms.ModelForm):

def __init__(self, user, *args, **kwargs):
self.user = user
super(IssueForm, self).__init__(*args, **kwargs)

TYPE_FIELDS = [
("Math", "Math"),
("Physics", "Physics"),
("Programming", "Programming"),
("Arts", "Arts")
]

issue_text = forms.CharField(widget=forms.Textarea, required=True)
issue_description = forms.CharField(widget=forms.Textarea, required=True)
issue_deadline = forms.DateField(required=True)
issue_fields = forms.ChoiceField(choices=TYPE_FIELDS, required=True)

class Meta:
model = Issue
fields = [
'issue_text',
'issue_description',
'issue_deadline',
'issue_fields'
]

def save(self, commit=True):
issue = super(IssueForm, self).save(commit=False)
issue.issue_text = self.cleaned_data['issue_text']
issue.issue_description = self.cleaned_data['issue_description']
issue.issue_deadline = self.cleaned_data['issue_deadline']
issue.issue_fields = self.cleaned_data['issue_fields']

if commit:
issue.published_by = self.user
issue.save()

return issue


and the related view:

views.py

def create_issue(request):
if ExtendedUser.objects.filter(user=request.user).exists():
if request.method == 'POST':
form = IssueForm(request.user, request.POST)
if form.is_valid():
form.save()
return redirect("/issues")
else:
form = IssueForm(request.user)
args = {'form': form}
return render(request, "issues/create_issue.html", args)
else:
raise Http404("You are not allowed to perform this action")


The forms works for every field in the model, they are all registered right, except for issue_fields. If i try giving a default value to the field in the model, that is the value that is saved on the database, otherwise I just get an empty field. Also I believe the problem comes from the form used, because if i try to create a new issue from the django admin interface it works just fine.
I feel like it's one of those silly mistakes, but I'm just starting with django and python in general and cannot figure it out on my own.
Thank you for your time!!

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