Fix factor data handling

[andrjohns]

Submission Checklist

• Run unit tests
• Declare copyright holder and agree to license (see below)

Summary

Fixes new errors with passing factor data

Copyright and Licensing

Please list the copyright holder for the work you are submitting
(this will be you or your assignee, such as a university or company):
Andrew Johnson

By submitting this pull request, the copyright holder is agreeing to
license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.05%. Comparing base (b271b7b) to head (3d9651e).
Report is 22 commits behind head on master.

❗ Current head 3d9651e differs from pull request most recent head f9fe22e

Please upload reports for the commit f9fe22e to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #999      +/-   ##
==========================================
- Coverage   84.20%   84.05%   -0.15%     
==========================================
  Files          13       13              
  Lines        4793     4849      +56     
==========================================
+ Hits         4036     4076      +40     
- Misses        757      773      +16     

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