Hey there! :)
Since FullCalendar is open source, it should be fairly straightforward to resolve the issues that you've listed. That said, I would be curious to take a look at the site that you're using the library on just in case there's an unexpected conflict with another library that you're using, if any. Either way, I'd be happy to help!
As for the standard "about me" formalities, I've been using JavaScript both professionally and as a hobby most of my life, and I've been freelancing as an expert in JavaScript for quite some time now. By all means, feel free to check my profile for a few testimonials from past clients, as well as to get to know a bit more about me.
With that out of the way, I'd love to hear from you as soon as possible. Toss me a reply so we can get started right away! I look forward to working with you. :)