Zotero not differentiating between publications by same author in same year

I've added 2 references by the same person in the same year. When I did this before, it labelled one as 'a', the next as 'b':

Bailey, L., 2015a. Reskilled and ‘Running Ahead’: Teachers in an international school talk about their work. Journal of Research in International Education [Online], 14(1), pp.3–15. Available from: https://doi.org/10.1177/1475240915572949 [Accessed 20 July 2019].

Bailey, L., 2015b. The experiences of host country nationals in international schools: A case-study from Malaysia. Journal of Research in International Education [Online], 14(2), pp.85–97. Available from: https://doi.org/10.1177/1475240915590557.

This time it's citing them so they both look the same. Do I need to do something manually to show these are different sources? Is it happening because they are videos rather than articles? Any help appreciated.

Kara, H., 2017. Ethical Principles [Online]. NCRMUK. Available from: https://www.youtube.com/watch?v=bKz1RmOnF7g [Accessed 13 August 2019].

Kara, H., 2017. Ethical Theories [Online]. NCRMUK. Available from: https://www.youtube.com/watch?v=dyF8UzDMNsw [Accessed 13 August 2019].
Sign In or Register to comment.