html adding a comma to user inputs on a form

I have a html form taking user inputs as per below. However, when the form submits, I get the data in the back-end in the below format. Notice that the make, model, and engine capacity data has a comma and brackets yet the other fields are okey. I really do not know why this is the case. Anyone help me fix this.

Description             Details Provided
MAKE:                    ('MAZDA',)
MODEL:                   ('ATENZA',)
TRIM DETAILS:             standard
ENGINE CAPACITY (cc):     (2000,)
FUEL TYPE:                PETROL
MILEAGE (km):             120000
TRANSMISSION:             AUTOMATIC
YEAR OF MANUFACTURE:      2009