There are too many places where this can go wrong, e.g. you have:
- a field which is (presumably) a Date/Time type;
- an undeclared parameter (which could therefore be anything at all);
- the Like operator (which is going to give you a string comparision);
- wildcards so it could pick up numbers anywhere in the string;
- an expectation that the formatting of the field affects the contents
(which is not the case).

To fix all that, we need to ensure Access is matching the data types
correctly, that the paremter is correct, and the comparsion is applied on
the right part of the field. The suggestion below expects the parameter to
be entered as a month number (i.e. 1 to 12), and then compares that to the
month part of the date. Note that this will retrieve records that match that
month, regardless of year.

1. In a fresh column in the Field row in query design, enter:
   Month([Job_Date])
In the Criteria row under this field, enter:
   [Enter Month Number]

2. Choose Parameters on the Query menu
Access opens a dialog.
Enter:
   [Enter Month Number]            Integer

For general suggestions on working with dates in Access in a country that
uses the d/m/y date format, see:
   International Date Formats in Access
at:
   http://allenbrowne.com/ser-36.html