Large exports are restricted for functionality; see https://confluence.atlassian.com/jirasoftwareserver0713/working-with-search-results-965542925.html, "Exporting your search results."
It doesn't say there, but I believe the default limit is 1,000 records for Jira server. Not sure what it is for Jira cloud.
If using server, see if your admin will increase the 100 record limit. Or, export in two sections (not ideal, but not difficult).
Sorry, should have been more specific. Assuming you're using a filter, fine tune the search to only bring back a certain subset, i.e., issues 1-99 or 100-155, or issues created in a certain date range, assigned to a person, or similar.
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