This sounds like the same issue as https://github.com/openwebwork/webwork2/issues/2588. It only affects Tests with more than one question per page.
A fix was put in about two weeks ago (https://github.com/openwebwork/webwork2/pull/2592). If you update the WeBWorK code (assuming that you're running 2.19) by running 'git pull' and then restart webwork it should fix the issue.
Thanks for pointing this out! It did indeed fix the issue.
I had checked the issues on github, but I must have missed this one.