Doesn't show all events on live server

I recommend using the browser developer tools (Network tab) to check what is being loaded and at what point.

The loading logic may not be correct. The development environment usually has much lower network delay and that may hide the problem when testing it locally.

Thank you for your reply. I have checked this and the results agree with what is on screen.

if tells me the form data is:
start: 2020-04-14T00:00:00,
end: 2020-04-18T00:00:00,
which on load shows nothing. I have to go to "March" first, then go back to "April" which then posts:
start: 2020-04-01T00:00:00
end: 2020-05-01T00:00:00
but this still only shows bookings that start in March.

if I drag the calendar to show 15th-22 April for example, the post is:
start: 2020-04-15T00:00:00
end: 2020-04-23T00:00:00
it will show the bookings. if I then the whole of April the ones it found will still show, but not the rest.

Again if I select. 9th-16th it will show these bookings, but when I click to show the whole of April it will still only show these 9th-16th bookings.

It is bizarre as it is working an absolute dream on my server here. it is as if it only wants to show specific dates I select and the viewport and number of bookings do not change unless I am dragging on the calendar.

It looks like if the request to get the full month failed on the server. In that case the data wouldn't be updated. I assume you switch the view and load the events using two different update() calls (or events.load() + update()).

You may want to check the response body of the data requests.

If you are using events.load() you may want to add the failure event handler or switch to jQuery $.ajax() and insert some breakpoints in the code to see what's going on.