I should start by telling I probably started the both series 'The Flash' and 'The Arrow' in the wrong order. I first watched 'The Flash' season , after that I started watching 'The Arrow' because I loved 'The Arrow' and his team since they were amazing in 'The Flash. In that series I recall Barry meeting Felicity for the first time, now I am watching 'The Flash' Season 1 Ep 8, and I see them meeting 'again' for the first time.
What I am wondering is, how the time flow is going between this series because halfway Season 1 of 'The Arrow' they are already talking about the 'Star Labs Particle Accelerator' and in Season 2 Ep 8 they are one day before the particle explosion.
But it takes 6-10 Episodes in 'The Flash' to see 'Felicity' for the first time.
Did they make a design flaw?