Large merge request doesn't show all changes

Hi everyone,

We are using GitLab for a while now, but only now we started to perform code reviews using merge requests.
I have just received a new merge request, that includes a lot of changes due to automated project tool generator (a lot of new files added and changed) you can see the amount of changes here:

This merge request includes also other changes which i wanted to code review (i see the changes in sourcetree), but unfortunately they are not displayed. not the files that were changed (in the file browser) and not the changes themselves.
is there a limit to the changes in merge request? any ideas for how to fix this?