The issue is that you have a form element named "size" on your search page. That is a reserved word in javascript and html and causes issues in dreamweaver.
If you just rename it to "sizes", or anything else that isn't a reserved word, then it will fix your issue.
You should be careful using reserved words. I see you also have a column in your database named "range", which is a reserved word in MySQL. It could come back to haunt you. Anytime you name something like a form element, database column, or database table, using a function name that exists in the language that will refer to it, you can run into difficulty.
HTML reserved words are javascript reserved words, and the attributes of tags. Size is already an attribute of an input element. That is why it can't also be its name:
https://www.w3schools.com/tags/att_input_size.asp
Javascript reserved words:
https://www.w3schools.com/js/js_reserved.asp
MySQL reserved words can be found here:
https://dev.mysql.com/doc/refman/8.0/en/keywords.html#keywords-8-0-detailed-R
It can be difficult to keep track of all of the reserved words, so I usually don't use actual words for form elements or column names. I use compound words, which will never be reserved like : "ProductSize" and "DataRange". If you always use two words, you never have to worry they might be reserved. You can also separate them with underscores.
