Questions posées lors d’un entretien d’embauche pour Software Engineer - Java Developer chez Sky

Applied on Otta.com and received an email to schedule first round. Initial round - There were 2 interviewers on the call. They were very friendly. I found this round very easy. They asked the basic java questions, about the spring framework and unit testing. After two days, HR called to convey my success in the initial round and inquired about my negotiable expected salary. Despite having updated my minimum salary on Otta, they offered £50K seemed insufficient for someone with 8 years of experience. Despite this, I accepted the offer. However, she further asked if I would disregard a higher offer from another company. It's puzzling why they wouldn't match industry standards given their knowledge of prevailing salaries. No further contacts afterwards.