Fix up a website having 'site compatibility issues' for some users

Good day to you, I have need of someone to go through a current site and see what is causing a few members to have issues when accessing one of my websites. We have had four members say they are either unable to a. List items or [login to view URL] emails in the Inbox. I have tried to replicate the issues but have been unable to on my laptop and iPad. As fixing this issue may require going through the code, to see where the problem originates, please keep this in mind when you bid for the project. Three have said they are using Apple products - macbook air, desktop and ipads running Safari but one said she is using Chrome on Windows 8.1 I would really like it if all members could access the site fully, regardless of which IT they are using. I can let you know the usernames of people who are having this issue, if it is of help. Thank you for taking the time to consider this project, and I look forward to hearing back from suitably experienced developers. When you bid, please include the length of time you believe you will need to finish the job, bid which do not include this will not be read as this is important. Regards