I think this means that there are 107 different dates that she is performing and that she sold out of tickets for all of them within seconds. This seems like a very poorly written article title.

I found the context for your question. https://www.independent.co.uk/arts-entertainment/music/news/adele-wont-tour-for-another-decade-to-concentrate-on-bringing-up-son-a7308826.html Shayla is correct. This means that a world-tour that included 107 different concert dates sold out online in only a few seconds.