I've booked with them multiple times without issues. Most online travel agents track your cookies and next time you visit, the price increases further. Same with hotel booking from sites like booking.com. Try using incognito next time you go to their site so you won't leave any cookies behind.
eDreams should be avoided at all costs. Pretty sure not Atol covered as based outside of IK. When I confirmed I wanted to buy a flight from them it kept increasing in price & they wanted more & more. Research online before buying from them.