Problem saving images - colour changes

<%- if @topic_view.topic.tags.present? %>
<%= t 'js.tagging.tags' %>: <%- @topic_view.topic.tags.each do |t| %> <%= t %> <%- end %>
<% end %>

I’m trying to save images to my website using my Silverstripe CMS (sorry, not sure how to tell which version), but the colour purple in the image changes to blue when I hit ‘save’.

Any advice?