Hello,
I have expertise in Magento and can fix the issues mentioned regarding: Dropdown, product page description navigation, browser compatibility, cart quantity, alignments, text and style.
Please provide the details in order to look into the issues. I would work on hourly basis and would only charge the real estimation. However, as per the current scenario I find that there is some issue in application navigation flow and multiple applying of code regarding drop down and off course some mistake in cart implementation. This whole would take at least 3 days to be sort out and final estimation i would provide once looking into the details.
Please open PMB for further discussion.
>>Thanks Sam, Owebest